Doubt (n.) when suppressed does not vanish but switches sides: its energy adds itself to the bold assertion, which one then insists on all the more, to one's own detriment.
Doubt (n.) is the believer's own worst enemy, always lurking behind belief; the thinker welcomes it as a stepping-stone.
Doubt (n.) is a precious gift because it does not violate the virginity of things beyond our ken.
Doubt (n.) about our civilization and its values is the neurosis of the age — if our convictions were truly beyond doubt, no one would ever doubt them.
Doubt (n.) alone is the mother of scientific truth; whoever fights dogma in high places falls victim to the tyranny of a partial truth.
Doubt (n.) devours a symbol: once you know a thing is symbolic you say it presumably means something else, and you cannot go back — Jung knew the Mass is true and could no longer see Christ in it.