Learning is the dictionary, but sense the grammar of science.

Go, poor devil, get thee gone! Why should I hurt thee? This world surely is wide enough to hold both thee and me.

I often derive a peculiar satisfaction in conversing with the ancient and modern dead, — who yet live and speak excellently in their works. My neighbors think me often alone, — and yet at such times I am in company with more than five hundred mutes — each of whom, at my pleasure, communicates his ideas to me by dumb signs — quite as intelligently as any person living can do by uttering of words.

Sciences may be learned by rote, but wisdom not.

The most accomplished way of using books is to serve them as some people do lords; learn their titles and then brag of their acquaintance.

We lose the right of complaining sometimes, by denying something, but this often triples its force.

The best friends in the world may differ sometimes.