Time is the most precious gift in our possession, for it is the most irrevocable. This is what makes it so disturbing to look back upon the time which we have lost. Time lost is time when we have not lived a full human life, time unenriched by experience, creative endeavor, enjoyment, and suffering. Time lost is time not filled, time left empty.

The essence of chastity is not the suppression of lust, but the total orientation of one's life towards a goal. Without such a goal, chastity is bound to become ridiculous. Chastity is the sine qua non of lucidity and concentration.

Costly grace is the gospel which must be sought again and again, the gift which must be asked for, the door at which a man must knock.

A god who let us prove his existence would be an idol.

And if we ask how are we to know where our hearts are, the answer is just as simple - everything which hinders us from loving God above all things and acts as a barrier between ourselves and our obedience to Jesus is our treasure, and the place where our heart is.

How wrong it is to use God as a stop-gap for the incompleteness of our knowledge. . . . We are to find God in what we know, not in what we don't know; God wants us to realize his presence, not in unsolved problems but in those that are solved. . . . God is no stop-gap; he must be recognized as the center of life, not when we are at the end of our resources.

Being a Christan is less about cautiously avoiding sin than about courageously and actively doing God's will.