The mathematicians are well acquainted with the difference between pure science, which has only to do with ideas, and the application of its laws to the use of life, in which they are constrained to submit to the imperfections of matter and the influence of accidents.

When a poet mentions the spring, we know that the zephyrs are about to whisper, that the groves are to recover their verdure, the linnets to warble forth their notes of love, and the flocks and herds to frisk over vales painted with flowers: yet, who is there so insensible of the beauties of nature, so little delighted with the renovation of the world, as not to feel his heart bound at the mention of the spring?

Truth has no gradations; nothing which admits of increase can be so much what it is, as truth is truth. There may be a strange thing, and a thing more strange. But if a proposition be true, there can be none more true.

[W]ith an unquiet mind, neither exercise, nor diet, nor physick can be of much use.

All envy is proportionate to desire; we are uneasy at the attainments of another, according as we think our own happiness would be advanced by the addition of that which he withholds from us.

He that would travel for the entertainment of others, should remember that the great object of remark is human life. Every Nation has something peculiar in its Manufactures, its Works of Genius, its Medicines, its Agriculture, its Customs, and its Policy. He only is a useful Traveller, who brings home something by which his country may be benefited; who procures some supply of Want, or some mitigation of Evil, which may enable his readers to compare their condition with that of others, to improve it whenever it is worse, and whenever it is better to enjoy it.

I am sorry I have not learnt to play at cards. It is very useful in life: it generates kindness, and consolidates society.