I knew almost nothing about the Tanakh coming into this; reading the book was a pretty mind-blowing experience. I've never read anything like it - first of all, it's not really a book. It's more like a bookshelf of the most canonical B.C. Hebrew writings. Tanakh is an acronym (TNK) standing for Torah, Prophets, and Writings. The Torah is kind of like a Jewish version of the Constitution in that it is the foundational text and lays out all of the most important rules of Judaism. But it's also much more than that. It's also full of mythology, history, stories, genealogies, detailed architectural descriptions, and more. Prophets starts with a detailed history of the kings of Judah and Israel, before becoming full of crazy visions of the prophets. Writings is the most diverse section of all, containing everything from the pious Psalms and Proverbs, to the erotic poem Song of Songs (Solomon's song) to the philosophical Book of Job to the existentialist Ecclesiastes to the wonderful tale of Esther. I think what was eye-opening to me was the sheer mass of culture, history, and thought stuffed into the Tanakh. Despite its huge bulk (this version is 1625 pages long), it seemed like every line was terse and either a reference to something else that occurred in the Tanakh, a reference to oral traditions, or an esoteric symbol. For example, one of the most intriguing one-liners is Genesis 6:4 - "The Nephilim were in the earth in those days, and also after that, when the sons of God came in unto the daughters of men, and they bore children to them; the same were the mighty men that were of old, the men of renown." There is so much to unpack in that one line it's ridiculous, and yet the Tanakh almost never refers to it again. Outside of the Tanakh there are other (non-canonical) writings that explain that the 'sons of God' were the 'Watchers' - angelic guardians of earth who became tempted by human women and became the fallen angels, and their children were giants and demons. There are tons of other one-liners like that - another example is when Leviticus describes the ritual of the scapegoat, and calls the goat Azazel. Why call the goat Azazel? One explanation (from the Book of Enoch) may be that Azazel was the name of a fallen angel. But who knows.
One of the most interesting parts of the Torah to me was the character of God. In the Torah, God appears and speaks and acts often, and in very interesting ways. First of all, God is an actual character with a distinct personality (of course, many would say that this isn't God's true personality, but just how it is conveyed by the authors of the Torah. But that doesn't make it any less interesting). And his personality is pretty volatile. God is at times wrathful - he destroys all of humanity (besides Noah) and entire cities sometimes, and he kills individuals on the reg. And he does it apparently because he is ANGRY. But at other times, he is surprisingly merciful. And he can be very, very patient. I liked the time when God decided to destroy Sodom, and Abraham asked God to spare it if there were 50 righteous people. God agrees - and then Abraham asks if there are 45 people. Then 40. Then 30. Then 20. Then 10. In my opinion, that is amazing patience for an all-powerful deity to deal with this annoying barterer. There are actually quite a few instances of people negotiating - SUCCESSFULLY - with God throughout the Tanakh, from some king begging for more years of life during an illness (and being granted them), to Ezekiel asking to bake his bread with cow dung instead of human poop, to God needing to convince Moses to be The Chosen One, to David begging God to not destroy Jerusalem after he had conducted a forbidden census. Another interesting aspect is how God occasionally refers to Israel (the concept) as his wife, and how they were so happy as newlyweds but their love eventually soured. All in all, God comes across as very human in the Torah - and seeing how God made man in his image, perhaps that makes sense.
I was surprised by Prophets, because the writings were surprisingly subversive. Like, I didn't realize that over a third of one of the world's most important religious texts is devoted to glorifying people who, in the modern day, would be similar to crazy homeless people screaming on the streets (especially Jeremiah). For example, Jeremiah was beaten and put in the stocks for a day to humiliate him. Later, he was imprisoned in a mud pit. He walked around wearing a yoke to symbolize the future Babylonian yoke on the Israelites, and he got into a fight with another prophet who broke his yoke. He bought underwear, wore it, hid it in a crevice for 'a long time', dug it back up, and found it was useless, just as Judah will be made useless to the Lord.
Ezekiel had ecstatic, crazy visions - my favorite by far in the whole Tanakh was his vision of God's chariot, with the eyed wheels (ophanim) and the four-faced angels (cherubim). (Another highlight is the giant flying scroll, a curse over the land, that Zechariah sees). (Another is Ezekiel's vision of the Valley of the Dry Bones, where an angel brings a whole valley full of the bones of Israel back to life). He also, from an outside perspective, must have appeared to be crazy. For example, Ezekiel decided to symbolize the destruction of Jerusalem by drawing a picture of Jerusalem on a block of clay, erecting 'siege works' against it, using an iron pan to represent a wall between himself and the city, and then laying on his left side for 390 days to represent the sin of Israel and another 40 days for the sins of Judah, while tied up with ropes. (Trivia: During this time, he was only allowed to eat a certain type of bread, 'siege bread' made of a collection of healthy but unpleasant grains, which is now commercially available under the Ezekiel brand). One funny part of this section is that God told him to bake the bread using human excrement, but Ezekiel protested and negotiated with God to allow him to use cow dung instead.
Anyway, I was impressed by the Prophets section, because the prophets, especially from an outside perspective, were legitimately nuts - if I saw someone lying on the street, bound in ropes, with a tiny mock city next to him, for 430 days, I would think he was insane. If I saw someone in the streets holding up raggedy, dirty underwear and explaining that he had buried them years ago and that this is what we will be to God - useless, dirty underwear - I would think he was nuts. The prophets were crazy performance artists but also rebels and protesters who were unafraid of speaking truth to power (both secular and clerical) and of being locked up, punished, and often killed. Even though they were kind of crazy, they're also kind of inspiring. The books of Prophets imbues Judaism, and therefore also Christianity, with a strain of thought that idolizes crazy visions, protest, and rejection of authority. Surprisingly subversive in my opinion.
Writings is the last section but contains what I found to be some of the most interesting books. I was surprised by the Book of Job - it goes straight for the jugular of one of the most fundamental questions in Judaism (and Christianity) - if a benevolent God rules the universe, why is there so much evil and suffering? Why do the evil flourish while the good suffer? A lot is spoken on this topic in the format of a discussion between Job and his 'friends.' Unfortunately, in my opinion a satisfying conclusion was not reached beyond, 'You're not qualified to judge what is good, just believe in God, this is above your pay grade.' Song of Songs had my jaw on the floor, because out of nowhere in this 1625-page tome of piety is a 14-page erotic love song that makes no mention of God whatsoever but DOES mention belly shots ("Your navel is like a round goblet, may it always be filled with spiced wine"). It gives an injection of pure lust and eroticism into the book in a way that I imagine Orthodox believers must have a hard time explaining. It makes me think that the authors and compilers of the Tanakh practiced Judaism in a way different than the most pious of modern-day believers (spoiler alert - the song is interpreted today as God's love for Israel, but it's clearly not). Then there's Ecclesiastes, which is a surprisingly subversive book in that it questions the meaning of life and doesn't provide a real answer. Ecclesiastes moans that life is meaningless because it is so brief and ends in death. The author of Ecclesiastes (the book is supposedly Solomon's journal) says that he has looked for meaning in everything under the sun - in accumulating riches, in luxury and love, in knowledge and wisdom - but in the end, what's the point? Everyone dies anyway. The wise and the fools die and nobody remembers that they existed. Even animals are on the same level as humans, because we all become dust in the end. The book ends by saying that the best we can do is to enjoy ourselves and have faith in God and follow his teachings. It's not a convincing ending, but if you really get existential about things, it's probably as good an answer as anyone else has come up with.
The craziest thing about the Tanakh, I think, is that it is only a drop in the bucket of Jewish/Christian writings and teachings. In fact, reading the Tanakh cover to cover is absolutely not the way you're supposed to read/study it. Every line of the Tanakh has been analyzed by dozens if not hundreds of famous commentators for literally millennia. And in addition to that, there is the Talmud, itself a vast collection of interpretations, analysis, and oral traditions that is at least quadruple the length of the Tanakh if not much more, which is the actual focus of most modern Jewish study. When you read the Tanakh, it is supposed to be with the help of a rabbi (aka an expert in Jewish studies who knows the interpretations of every line) and often in the context of Jewish holidays and services (for example, the entire book of Esther is read on Purim; the entire book of Jonah is read on Yom Kippur; Ecclesiastes is read during Sukkot; some Jewish sects read the entire book of Psalms every Shabbat). I came into this being very ignorant about the sophistication of Judaism. Reading the Tanakh has really opened my eyes about the nature of Judaism. First, it's an ancient faith with strong roots to times contemporaneous with the Iliad and even older. I'm blown away that Purim celebrates an event (Esther saving the Jews in Persia from Haman) that occurred at about the same time as the Persian wars recorded by Herodotus (supposedly the 'first historian'). Second, it has evolved, often radically, and the current faith looks nothing like the ancient faith, even while retaining many of the ancient practices (for example, much of the Torah is devoted to explaining how to perform sacrifices; modern-day Judaism has no sacrifices because the Temple where sacrifices were performed was destroyed... 2000 years ago). Third, the Jewish texts are basically a legal system (plus cultural and religious system) - Judaism is a religion of interpretation. The Torah forms the core, but every century and millennium has added a new layer to that core. And, in fact, the Talmud is today arguably more relevant than the Tanakh to every day Jewish life. Some examples that I found interesting are that nowhere in the Tanakh is wearing a kippah mentioned; this was a later Talmudic innovation that has become central to Jewish identity. Similarly, the Torah only says that you cannot cook a lamb in its mother's milk, but this has become interpreted as being that you can't eat dairy and meat in the same meal. As far as I could tell, rabbis did not exist in the Tanakh; they, too (and all of rabbinical Judaism), were a later innovation probably necessitated by the Roman exile.
I don't have much to say about the actual religion (that is, the actual act of believing in the Jewish God). But, I'm very impressed by the text of the Tanakh. It is one of the only anchors we have to a time that was so ancient that the Greeks were barely yet writing. It blows my mind that every week, people sing Psalms that may have been composed in the time of King David, only 200 or so years after the events of the Iliad, about 300 years before Rome was founded. And that the thread of Jewish thought was never lost over that entire time - the Torah (supposedly) records Jewish beliefs from Moses's time; Prophets covers the time from the Assyrian captivity to Cyrus's restoration of Jerusalem; and Writings goes all the way up to the 100s BC. From there, certain apocryphal books (such as Maccabees) as well as the Talmud were composed all the way through the Dark Ages. And from there, famous medieval Jewish scholars, such as Maimonides and Rashi, and after that many more who I don't even know of.