Quotes about Doubt

"Philosophy when superficially studied, excites doubt, when thoroughly explored, it dispels it."
-- Francis Bacon

"The road to perseverance lies by doubt."
-- Francis Quarles

"Doubt is the father of invention."
-- Galileo Galilei

"Doubt is the beginning, not the end, of wisdom."
-- George Iles

"Doubt is a pain too lonely to know that faith is his twin brother."
-- Kahlil Gibran

"To have doubted one's own first principles is the mark of a civilized man."
-- Oliver Wendell Holmes

"I respect faith, but doubt is what gives you an education."
-- Wilson Mizner