March 17th
Book Three, Chapter 39
That a Man Must not be too Anxious About his Affairs

Would that I might not be too much set upon future events, but unhesitatingly offer myself to Your good pleasure.  Oftentimes a man vehemently pursues something which he desires; but when he has obtained it, he begins to be of another mind.  For our affections are not enduring with regard to the same object, but we rather drive onward from one to another....Man's true progress consists in denying himself, and the man of self-denial is very much at liberty, and secure likewise.