Paul Tillich

Faith consists in being vitally concerned with that ultimate reality to which I give the symbolical name of God. Whoever reflects earnestly on the meaning of life is on the verge of an act of faith.

Faith is an act of a finite being who is grasped by, and turned to, the infinite.

Faith is the state of being ultimately concerned.

Doubt is not the opposite of faith; it is one element of faith.

The courage to be is rooted in the God who appears when God has disappeared in the anxiety of doubt.

The first duty of love is to listen.