This is one of Augustine’s earliest works. Written only a few years after his conversion, this treatise is an anti-Manicheisn polemic where Augustine repudiates his former cult and answers the objections that kept him from embracing Christianity. Much of his answers rely on Platonic influenced Christianity to combat the materialism of Manichaeism. This work is a sort of snapshot of the familiar themes such as the nature of time, the nature of evil, and man's free will that will be more fully developed in Augustine’s later works.
What exists is good and evil does not have any proper existence:
"Things are born, die, are dissolved or broken up. But so far as they do exist they have existence from the eternal God, being created by his truth. To the rational and intellectual soul is given to
enjoy the contemplation of his eternity" (page 4)
"For every idea comes from him. Who is he, then, save the one God, the one truth, the one salvation of all, the first and highest essence from which all that exists derives existence as such? For all existence as such is good. The highest essence imparts existence to all that exists. That is why it is called essence. Death imparts no actual existence to anything which has died. If it is really dead it has indubitably been reduced to nothingness. For things die only in so far as they have a decreasing part in existence." (20-21)
"Existence as such is good, and supreme existence is the chief good. From what did he make them? Out of nothing. Whatever is must have some form, and though it be but a minimal good it will be good and will be of God. The highest form is the highest good, and the lowest form is the lowest good. Every good thing is either God or derived from God. Therefore even the lowest form is of God." (31-32)
Sin being the disorder of loves and salvation involves seeing beyond the "shadows" of this life:
"They love the works of the artificer more than the artificer or his art, and are punished by falling into the error of expecting to find the artificer and his art in his works, and when they cannot do so they think that the works are both the art and the artificer. God is not offered to the corporeal senses, and transcends even the mind…This is the origin of all impiety of sinners who have been condemned for their sins. Not only do they wish to scrutinize the creation contrary to the commandment of God, and to enjoy it rather than God’s law and truth—that was the sin of the first man who misused his free will" (64)
"Seek therefore the highest agreeableness. Do not go abroad. Return within yourself. In the inward man dwells truth. If you find that you are by nature mutable, transcend yourself. But remember in doing so that you must also transcend yourself even as a reasoning soul. Make for the place where the light of reason is kindled. What does every good reasoner attain but truth? And yet truth is not reached by reasoning, but is itself the goal of all who reason." (69)
Augustine's argument for inscrutable truth that predates Descartes' argument:
"Everyone who knows that he has doubts knows with certainty something that is true, namely, that he doubts. He is certain, therefore, about a truth. Therefore everyone who doubts whether there be such a thing as the truth has at least a truth to set a limit to his doubt; and nothing can be true except truth be in it. Accordingly, no one ought to have doubts about the existence of the truth, even if doubts arise for him from every possible quarter." (70)
The nature of Time:
"In eternity there is neither past nor future. What is past has ceased to be, and what is future has not yet begun to be. Eternity is ever the same. It never “was” in the sense that it is not now, and it never “will be” in the sense that it is not yet. Wherefore, eternity alone could have said to the human mind “I am what I am.” And of eternity alone could it be truly said: “He who is hath sent me” (Ex. 3:14)." (93)
4/5 A summation of Augustine's enduring ideas found within his early works