You have noticed that the human being is a curiosity. In times past he has had (and worn out and flung away) hundreds and hundreds of religions; today he has hundreds and hundreds of religions, and launches not fewer than three new ones every year. I could enlarge on that number and still be within the facts.

We could use up two Eternities in learning all that is to be learned about our own world and the thousands of nations that have arisen and flourished and vanished from it. Mathematics alone would occupy me eight million years.

If you tell the truth you do not need a good memory!

You need not expect to get your book right the first time. Go to work and revamp or rewrite it. God only exhibits his thunder and lightning at intervals, and so they always command attention. These are God's adjectives. You thunder and lightning too much; the reader ceases to get under the bed, by and by.

It is sound judgment to put on a bold face and play your hand for a hundred times what it is worth; forty-nine times out of fifty nobody dares to call it, and you roll in the chips.

How easy it is to make people believe a lie, and [how] hard it is to undo that work again!

There's always something about your success that displeases even your best friends.