Truth is tough. It will not break, like a bubble, at a touch; nay, you may kick it about all day like a football, and it will be round and full at evening.

The very aim and end of our institutions is just this: that we may think what we like and say what we think.

It's faith in something and enthusiasm for something that makes a life worth living.

The man who is always worrying about whether or not his soul would be damned generally has a soul that isn't worth a damn.

To be seventy years young is sometimes far more cheerful and hopeful than to be forty years old.

Youth longs and manhood strives, but age remembers.

Science is a first-rate piece of furniture for a man's upper chamber, if he has common sense on the ground-floor. But if a man hasn't got plenty of good common sense, the more science he has, the worse for his patient.