Doubt can only be removed by action.
The greater the knowledge, the greater the doubt.
Doubt grows with knowledge.
We know accurately only when we know little, with knowledge doubt increases.
No doubt you are right... there would be far less suffering amongst mankind if men... did not employ their imaginations so assiduously in recalling the memory of past sorrow, instead of bearing their present lot with equanimity.
If you must tell me your opinions, tell me what you believe in. I have plenty of doubts of my own.
Give me the benefit of your convictions, if you have any; but keep your doubts to yourself, for I have enough of my own.
I will listen to anyone's convictions, but pray keep your doubts to yourself.
There is no permanence in doubt; it incites the mind to closer inquiry and experiment, from which, if rightly managed, certainty proceeds, and in this alone can man find thorough satisfaction.
With knowledge grows doubt.
With knowledge comes more doubt.
Don't give us your doubts, gives us your certainties, for we have doubts enough of our own.
Most pioneers are at the mercy of doubt at the beginning, whether of their worth, of their theories, or of the whole enigmatic field in which they labour.
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