Doubt begins only at the last frontiers of what is possible.
Sentiment: NEGATIVE
Doubt grows with knowledge.
Doubt, the essential preliminary of all improvement and discovery, must accompany the stages of man's onward progress. The faculty of doubting and questioning, without which those of comparison and judgment would be useless, is itself a divine prerogative of the reason.
Doubt is not a pleasant condition, but certainty is absurd.
Doubt is not below knowledge, but above it.
Wonder rather than doubt is the root of all knowledge.
When nothing is sure, everything is possible.
Doubt, of whatever kind, can be ended by action alone.
Doubt is an uneasy and dissatisfied state from which we struggle to free ourselves and pass into the state of belief; while the latter is a calm and satisfactory state which we do not wish to avoid, or to change to a belief in anything else.
The deplorable mania of doubt exhausts me. I doubt about everything, even my doubts.
To believe with certainty we must begin with doubting.