What a blessed thing it is, that Nature, when she invented, manufactured, and patented her authors, contrived to make critics out of the chips that were left!

Without wearing any mask we are conscious of, we have a special face for each friend.

Science is the topography of ignorance.

[Science is] piecemeal revelation.

Don't flatter yourselves that friendship authorizes you to say disagreeable things to your intimates. On the contrary, the nearer you come into relation with a person, the more necessary do tact and courtesy become.

We are all tattooed in our cradles with the beliefs of our tribe; the record may seem superficial, but it is indelible. You cannot educate a man wholly out of the superstitious fears which were early implanted in his imagination; no matter how utterly his reason may reject them...

There is no friend like an old friend who has shared our morning days, no greeting like his welcome, no homage like his praise.