Accident is the name of the greatest of all inventors.

An expert is a man who has made all the mistakes which can be made in a very narrow field.

Any man worth his salt will stick up for what he believes right, but it takes a slightly better man to acknowledge instantly and without reservation that he is in error.

Every new opinion, at its starting, is precisely in a minority of one.

If you never change your mind, why have one?

Many a man thinks he is buying pleasure, when he is really selling himself to it.

Memory moderates prosperity, decreases adversity, controls youth and delights old age.

Men are what their mothers made them.

Prevention is better than cure.

Tact is the art of making guests feel at home when that's really where you wish they were.

The lion and the calf will lay down together, but the calf won't get much sleep.

The real measure of your wealth is how much you'd be worth if you lost all your money.

We judge ourselves by what we feel capable of doing, while others judge us by what we have already done.

When you sell a man a book, you don't sell him 12 ounces of paper and ink and glue - you sell him a whole new life.