History warns us that it is the customary fate of new truths to begin as heresies and to end as superstitions.
Irrationally held truths may be more harmful than reasoned errors.
All truth, in the long run, is only common sense clarified.
Time, whose tooth gnaws away everything else, is powerless against truth.
Nothing great in science has ever been done by men, whatever their powers, in whom the divine afflatus of the truth-seeker was wanting.
Veracity is the heart of morality.
To say that an idea is necessary is simply to affirm that we cannot conceive the contrary; and the fact that we cannot conceive the contrary of any belief may be a presumption, but is certainly no proof, of its truth.
There is nothing of permanent value (putting aside a few human affections) nothing that satisfies quiet reflection--except the sense of having worked according to one's capacity and light to make things clear and get rid of cant and shams of all sorts.
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