In literature imitations do not imitate.

[I] shall never use profanity except in discussing house rent and taxes. Indeed, upon second thought, I will not use it then, for it is unchristian, inelegant, and degrading--though to speak truly I do not see how house rent and taxes are going to be discussed worth a cent without it.

When the Lord finished the world, he pronounced it good. That is what I said about my first work, too. But Time, I tell you, Time takes the confidence out of these incautious opinions. It is more than likely that He thinks about the world, now, pretty much as I think about the Innocents Abroad. The fact is, there is a trifle too much water in both.

There is nothing that saps one's confidence as the knowing how to do a thing

It is a time when one’s spirit is subdued and sad, one knows not why; when the past seems a storm-swept desolation, life a vanity and a burden, and the future but a way to death. It is a time when one is filled with vague longings; when one dreams of flight to peaceful islands in the remote solitudes of the sea, or folds his hands and says, What is the use of struggling, and toiling and worrying any more? let us give it all up.

The nation is divided, half patriots and half traitors, and no man can tell which from which.

The weakest of all weak things is a virtue that has not been tested in the fire.