January 22nd
Book One, Chapter 22
Of the Consideration of Human Misery

Oh, how great is human frailty, which is ever prone to vice!  Today you confess your sins, and tomorrow you again commit what you had confessed.  Now you propose to be on your guard, and an hour after you are acting as if you had made no resolution.
Justly then may we humble ourselves, and never think anything great of ourselves; since we are so frail and unstable.