And obstinacy is the sister of constancy, at least in vigour and stability.

All other knowledge is hurtful to him who has not honesty and good-nature

Who ever saw a doctor use the prescription of his colleague without cutting out or adding something?

A wise man loses nothing, if he but save himself.

If atoms do, by chance, happen to combine themselves into so many shapes, why have they never combined together to form a house or a slipper? By the same token, why do we not believe that if innumerable letters of the Greek alphabet were poured all over the market-place they would eventually happen to form the text of the Iliad?

If not for that of conscience, yet at least for ambition's sake, let us reject ambition, let us disdain that thirst of honor and renown, so low and mendicant; that it makes us beg it of all sorts of people.

Tis well for old age that it is always accompanied with want of perception, ignorance, and a facility of being deceived. For should we see how we are used and would not acquiesce, what would become of us?