Libraries can in general be too narrow or too wide for the soul.

Nothing makes one old so quickly as the ever-present thought that one is growing older.

The American who first discovered Columbus made a bad discovery.

He swallowed a lot of wisdom, but all of it seems to have gone down the wrong way.

A schoolteacher or professor cannot educate individuals, he educates only species.

As the few adepts in such things well know, universal morality is to be found in little everyday penny-events just as much as in great ones. There is so much goodness and ingenuity in a raindrop that an apothecary wouldn't let it go for less than half-a-crown.

The great trick of regarding small departures from the truth as the truth itself - on which is founded the entire integral calculus - is also the basis of our witty speculations, where the whole thing would often collapse if we considered the departures with philosophical rigour.