No amount of observations of white swans can allow the inference that all swans are white, but the observation of a single black swan is sufficient to refute that conclusion.

Reasoning from the common course of nature, and without supposing any new interposition of the Supreme Cause, which ought always to be excluded from philosophy; what is incorruptible must also be ingenerable. The soul, therefore, if immortal, existed before our birth: And if the former existence noways concerned us, neither will the latter.

When men are most sure and arrogant they are commonly most mistaken, giving views to passion without that proper deliberation which alone can secure them from the grossest absurdities.

Courage, of all national qualities, is the most precarious; because it is exerted only at intervals, and by a few in every nation; whereas industry, knowledge, civility, may be of constant and universal use, and for several ages, may become habitual to the whole people.

One would appear ridiculous who would say, that it is only probable the sun will rise to-morrow, or that all men must die; thoughit is plain we have no further assurance of these facts than what experience affords us.

Every movement of the theater by a skilful poet is communicated, as it were, by magic, to the spectators; who weep, tremble, resent, rejoice, and are inflamed with all the variety of passions which actuate the several personages of the drama.

It is harder to avoid censure than to gain applause.