When in doubt, C-4.

Criticism, though dignified from the earliest ages by the labours of men eminent for knowledge and sagacity, has not yet attained the certainty and…

— Samuel Johnson

“Men wanted certainties, not more causes for doubt, and since the discoveries of science perplexed them with strange theories about the earth on which…

— C. V. Wedgewood

[I]f in other sciences we should arrive at certainty without doubt and truth without error, it behooves us to place the foundations of knowledge…

— Roger Bacon

One may not doubt that, somehow Good Shall come of Water and of Mud; And sure, the reverent eye must see A purpose in…

— Rupert Brooke

Vision motivates, sustains and dispels doubt.

— Thomas Young

For diplomacy to be effective, words must be credible - and no one can now doubt the word of America.

— George W. Bush

“Two powerful, little words I've learned to use when facing challenges, fears, and doubts— so what? ”

— Richelle E. Goodrich

“Let no one hope to find in contemplation an escape from conflict, from anguish or from doubt. On the contrary, the deep, inexpressible certitude…

— Thomas Merton

How could you feel worthless when God has honoured you by creating you and choosing you to be with Him, in this life and…

— Yasmin Mogahed

There is no doubt in my mind and I know in my time, there will be a Canadian basketball player playing for Toronto Raptors, 100%

— Masai Ujiri

We know accurately only when we know little, with knowledge doubt increases.

— Johann Wolfgang von Goethe

“Where there is doubt (shanka), there is misery. The moment one begins to doubt the knowledge that, 'I am Chandubhai,' misery arises. Once one…

— Dada Bhagwan

I don't doubt that straight white men have identity issues and identity complexes and struggle with defining themselves.

— Justin Simien

Because of the womb being a central phenomenon in the feminine body, the whole psychology of woman differs: she is non-aggressive, non-inquiring, non-questioning, non-doubting,…

— Rajneesh

I put myself in the student's place and remember the frustrations, doubts, determination, and desires I felt when I was going through the initial…

— Ted Martinez