Having manifested what he was and what he is, he shows the great fruit of his confession; and being about to examine by what method God and the happy life may be found, he enlarges on the nature and power of memory. Then he examines his own acts, thoughts and affections, viewed under the threefold division of temptation; and commemorates the Lord, the one mediator of God and men. — Memory Retains All Things.

20 All these things I retain in my memory, and how I learnt them I retain. I retain also many things which I have heard most falsely objected against them, which though they be false, yet is it not false that I have remembered them; and I remember, too, that I have distinguished between those truths and these falsehoods uttered against them; and I now see that it is one thing to distinguish these things, another to remember that I often distinguished them, when I often reflected upon them. I both remember, then, that I have often understood these things, and what I now distinguish and comprehend I store away in my memory, that hereafter I may remember that I understood it now. Therefore also I remember that I have remembered; so that if afterwards I shall call to mind that I have been able to remember these things, it will be through the power of memory that I shall call it to mind.