One must verify or expel his doubts, and convert them into the certainty of Yes or NO.
Sentiment: NEGATIVE
By doubting we are led to question, by questioning we arrive at the truth.
Doubt is the incentive to truth and inquiry leads the way.
Doubt your doubts before you doubt your beliefs.
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.
Whenever man begins to doubt himself, he does something so stupid that he is reassured.
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.
To believe with certainty we must begin with doubting.
If a man will begin with certainties, he shall end in doubts, but if he will content to begin with doubts, he shall end in certainties.