We find in the course of nature that though the effects be many, the principles from which they arise are commonly few and simple, and that it is the sign of an unskilled naturalist to have recourse to a different quality in order to explain every different operation.

It affords a violent prejudice against almost every science, that no prudent man, however sure of his principles, dares prophesy concerning any event, or foretell the remote consequences of things.

...virtue is attended by more peace of mind than vice, and meets with a more favourable reception from the world. I am sensible, that, according to the past experience of mankind, friendship is the chief joy of human life and moderation the only source of tranquillity and happiness.

Human happiness seems to consist in three ingredients; action, pleasure and indolence. And though these ingredients ought to be mixed in different proportions, according to the disposition of the person, yet no one ingredient can be entirely wanting without destroying in some measure the relish of the whole composition.

All that belongs to human understanding, in this deep ignorance and obscurity, is to be sceptical, or at least cautious, and not to admit of any hypothesis whatever, much less of any which is supported by no appearance of probability.

The mind is a kind of theater, where several perceptions successively make their appearence; pass, re-pass, glide away, and mingle in an infinite variety of postures and situations.

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.