No instance exists of a person's writing two language perfectly. That will always appear to be his native language which was most familiar to him in his youth.

The movements of nature are in a never ending circle. The animal species which has once been put into a train of motion, is still probably moving in that train. For if one link in nature's chain might be lost, another and another might be lost, till this whole system of things should evanish by piece-meal; a conclusion not warranted by the local disappearance of one or two species of animals, and opposed by the thousands and thousands of instances of the renovating power constantly exercised by nature for the reproduction of all her subjects, animal, vegetable, and mineral.

Take things always by their smooth handle.

I had rather be shut up in a very modest cottage, with my books, my family, and a few old friends, dining on simple bacon, and letting the world roll on as it liked, than to occupy the most splendid post which any human power can give.

While wading through the whimsies, the puerilities, and unintelligible jargon of this work [Plato's Republic], I laid it down often to ask myself how it could have been that the world should have so long consented to give reputation to such nonsense as this?

He who knows best knows how little he knows.

I never submitted the whole system of my opinions to the creed of any party of men whatever, in religion, in philosophy, in politics, or in anything else, where I was capable of thinking for myself. Such an addiction is the last degradation of a free and moral agent. If I could not go to heaven but with a party, I would not go there at all.