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

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

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

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

Faith is the state of being ultimately concerned

Doubts are the ants in the pants of faith. They keep it awake and moving.