Doubt is the father of invention.
Doubt begins only at the last frontiers of what is possible.
REVIEW, v.t. To set your wisdom (holding not a doubt of it./ Although in truth there's neither bone nor skin to it)/ At work upon a book, and so read out of it/ The qualities that you have first read into it.
A person who doubts himself is like a man who would enlist in the ranks of his enemies and bear arms agains himself. He makes his failure certain by himself being the first person to be convinced of it.
Doubt, indulged and cherished, is in danger of becoming denial; but if honest, and bent on thorough investigation, it may soon lead to full establishment of the truth.
When you doubt, abstain.
Who never doubted, never half believed. Where doubt is, there truth is - it is her shadow.
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