“Some laymen feel that, out of loyalty, they ought to cling to ancient ways of expressing the Christian faith and that to doubt is to sin. But doubt is not the enemy of faith. It is the growing edge of faith...”

“Faith which does not doubt is dead faith.”

Miguel de Unamuno (1864–1936) 19th-20th century Spanish writer and philosopher

“For nothing worthy proving can be proven,
Nor yet disproven: wherefore thou be wise,
Cleave ever to the sunnier side of doubt,
And cling to Faith beyond the forms of Faith!”

Alfred, Lord Tennyson (1809–1892) British poet laureate

“Sometimes doubting is not a lack of faith, but an expression of it. Sometimes to doubt is to merely insist that God be taken seriously not frivolously, to insist that our faith is placed in and upheld by something other than seeming conjuring tricks.”

Mark Buchanan (1961) American physicist

“You know, my faith is one that admits some doubt.”

Barack Obama (1961) 44th President of the United States of America

“Life is doubt,
And faith without doubt is nothing but death.”

Miguel de Unamuno (1864–1936) 19th-20th century Spanish writer and philosopher

“faith without doubt is addiction”

Salman Rushdie (1947) British Indian novelist and essayist

“The opposite of faith is not doubt, it’s certainty.”

Anne Lamott (1954) Novelist, essayist, memoirist, activist

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

Paul Tillich (1886–1965) German-American theologian and philosopher

“Certainly you will have doubts. There will be questionings and faith will return again. That is how faith is established.”

Sarada Devi (1853–1920) Hindu religious figure, spiritual consort of Ramakrishna