Curiosity in children ... is but an appetite after knowledge and therefore ought to be encouraged in them, not only as a good sign, but as the great instrument nature has provided to remove that ignorance they were born with and which, without this busy inquisitiveness, will make them dull and useless creatures.

In short, herein seems to lie the difference between idiots and madmen, that madmen put wrong ideas together, and so make wrong propositions, but argue and reason right from them: but idiots make very few or no propositions, and reason scarce at all.

These two, I say, viz. external material things, as the objects of SENSATION, and the operations of our own minds within, as the objects of REFLECTION, are to me the only originals from whence all our ideas take their beginnings.

This is to think, that men are so foolish, that they take care to avoid what mischiefs may be done them by pole-cats, or foxes; but are content, nay, think it safety, to be devoured by lions.

Untruth being unacceptable to the mind of man, there is no other defence left for absurdity but obscurity.

Affectation is an awkward and forced imitation of what should be genuine and easy, wanting the beauty that accompanies what is natural.

Habits wear more constantly and with greatest force than reason, which, when we have most need of it, is seldom fairly consulted, and more rarely obeyed