Certainty... lurks at the door of faith and threatens to devour it.

In order to help another effectively, I must understand what he understands. If I do not know that, my greater understanding will be of no help to him... instruction begins when you put yourself in his place so that you may understand what he understands and in the way he understands it.

Worldly wisdom thinks that love is a relationship between man and man. Christianity teaches that love is a relationship between man-God-man, that is, that God is the middle term.

There are two kinds of geniuses. The characteristic of the one is roaring, but the lightning is meagre and rarely strikes; the other kind is characterized by reflection by which it constrains itself or restrains the roaring. But the lightning is all the more intense; with the speed and sureness of lightning it hits the selected particular points - and is fatal.

Do it or don't do it - you will regret both.

Instruction begins when you, the teacher, learn from the learner; put yourself in his place so that you may understand . . . what he learns and the way he understands it.

Only the noble of heart are called to difficulty.