For one swallow does not make a summer, nor does one day; and so too one day, or a short time, does not make a man blessed and happy.

It is simplicity that makes the uneducated more effective than the educated when addressing popular audiences.

Demonstration is also something necessary, because a demonstration cannot go otherwise than it does, ... And the cause of this lies with the primary premises/principles.

All human actions have one or more of these seven causes: chance, nature, compulsions, habit, reason, passion, desire.

These two rational faculties may be designated the Scientific Faculty and the Calculative Faculty respectively; since calculation is the same as deliberation, and deliberation is never exercised about things that are invariable, so that the Calculative Faculty is a separate part of the rational half of the soul.

Of cases where a man is truthful both in speech and conduct when no considerations of honesty come in, from an habitual sincerity of disposition. Such sincerity may be esteemed a moral excellence; for the lover of truth, who is truthful even when nothing depends on it, will a fortiori be truthful when some interest is at stake, since having all along avoided falsehood for its own sake, he will assuredly avoid it when it is morally base; and this is a disposition that we praise.

Fortune favours the bold.