This is a book about the history of Westerners' struggle for liberties and rights from the time of the Reformation onward. Grayling covers religious liberties, freedom of inquiry during the scientific revolution, the abolition of slavery, workers' rights, women's rights, changing ideas about democracy, and the more recent notion of universal human rights (and the threat they face in post-9/11 America and Britain). He does a good job of explaining how one successful struggle for greater equality and fairness led to public awareness of other wrongs and the resulting struggle to remedy them. Based on Grayling's book, I imagine the history of human rights as a line of dynamite sticks, with the first spark being lit when centralized political power was wrested away from the Catholic church. The fire then progressed to each successive stick of dynamite, igniting change in a different sphere of human life.
But this analogy doesn't entirely work, because Grayling also records how previously achieved progress can be undone and emphasizes that the active maintenance of rights and liberties is a constant task. The moment those rights stop being actively maintained, or are subverted or weakened through legislation, advances that took centuries to achieve can be reversed. And it's unfortunately much easier to do away with a previously-granted liberty than to get it back after it's been taken away.
So maybe a better analogy is an arduous mountain climb, where there's always the chance of a misstep or a halt in the general upward trend. Grayling combines these two perspectives -- the dynamite-like spread of ideas about change, and the long, slow process of making and keeping practical gains -- into one central argument. The idea that women should have equal rights, for example, may have originally entered the sphere of public debate because discussions about abolishing slavery paved the way, but the actual process of gaining women's rights in a pragmatic, concrete sense took decades and still continues to this day, with several setbacks along the way. Nevertheless, Grayling argues, people want to be free, and once the process has been set in motion, increasing liberties is inevitable.
Grayling presents a particularly compelling case that the entrenched ruling classes of Europe and America opposed progress every step of the way out of fear, greed, snobbery, and conformity, meaning that religious dissenters, scientists, women, slaves, minorities, workers, and others had to work long and hard to wrest even an ounce of power from the hands of the elites -- mostly clergymen and people with inherited family money or positions of political authority. It's important to realize that throughout history, conservatives -- whatever name they may go by in their particular country or era -- have done everything in their power to restrict open inquiry, maintain their own privileges at the expense of basic rights for others, and slow the progress of democracy and equality every single inch of the way.
Many conservatives, when looking back over history, realize the inhumanity and uncharitableness of the previous generation's conservative views (for example, no conservatives today are arguing in favor of slavery), and therefore modern conservatives have to do whatever they can to distance themselves from these discredited ideas, all the while resisting progress in their own time period, unaware that in 100 years, everyone in that future era will shake their heads in shame at how the conservatives of the 21st century treated their fellow citizens. The fact that we in the West enjoy as many liberties as we do is in spite of the undermining efforts of conservatives, a group which has traditionally been overwhelmingly comprised of those who believe that some deity is on their side, giving divine sanction to their greed, self-interest, and ambition.
My one (minor) complaint about this book is that it's sometimes overly dry and stuffy in tone. There are times when Grayling writes with true passion, energy, and lucidity, but there are many other times when his writing is awkward and overly complex. He also sometimes reserves too much page time for his pet interests, even if they are only tangentially relevant to the topic at hand, and loses his central argument in a slew of minute historical details that don't obviously relate to the thesis of the chapter. I also found it a bit odd that Grayling chose to leave out discussion of the modern struggle for equal freedoms faced by atheists/secularists and homosexuals in the modern Western world, but I assume this is because he wanted to keep the book a reasonable length, and these two issues could each warrant an entire chapter in their own right.
Overall, however, this an excellent book for anyone interested in why and how the contemporary West has advanced further than any other group in world history in terms of the extension of equal rights and liberties for all human beings, not just wealthy, white, male, and religious human beings.