Mark Twain

Courage is resistance to fear, mastery of fear, not absence of fear.

Necessity is the mother of taking chances.

It is curious that physical courage should be so common in the world and moral courage so rare.

Prophesy is a good line of business, but it is full of risks.

Wit is the sudden marriage of ideas which, before their union, were not perceived to have any relation.

Everything human is pathetic. The secret source of humor itself is not joy but sorrow. There is no humor in heaven.

The secret source of humor is not joy but sorrow; there is no humor in Heaven.

Humor must not professedly teach and it must not professedly preach, but it must do both if it would live forever.

Humor is mankind's greatest blessing.

The wit knows that his place is at the tail of a procession.

Principles have no real force except when one is well-fed.

I have never taken any exercise, except sleeping and resting, and I never intend to take any.