Doubt isn't the opposite of faith; it is an element of faith... - Paul Tillich

"Sometimes I think it is my mission to bring faith to the faithless, and doubt to the faithful."

"Doubt isn't the opposite of faith; it is an element of faith."

"The first duty of love is to listen."

"Astonishment is the root of philosophy."

"Doubt isn't the opposite of faith; it is an element of faith."