A question that sometimes drives me hazy: Am I, or the others, crazy?

It is a waste of energy to be angry with a man who behaves badly, just as it is to be angry with a car that won't go.

The U.S. Census Bureau acknowledged this fact when it reported that those with a bachelor's degree earn on average $1 million more over their lifetime than those with only a high school diploma.

Of mankind we may say in general they are fickle, hypocritical, and greedy of gain.

People are more difficult to work with than machines. And when you break a person, he can't be fixed.

People who know little are usually great talkers, while men who know much say little.

A man is great by deeds, not by birth.

No mortal can keep a secret. If the lips are silent, he chatters with his fingertips; betrayal oozes out of him at every pore.

Great minds discuss ideas. Average minds discuss events. Small minds discuss people.

I just invent, then wait until man comes around to needing what I've invented.

A person's a person, no matter how small.

Ninety-nine percent of who you are is invisible and untouchable.

I despise people who depend on these things [heroin and cocaine]. If you really want a mind-altering experience, look at a tree.

Humanity is acquiring all the right technology for all the wrong reasons.

The greatest attitude of all is gratitude.

We are not enemies, but friends. We must not be enemies. Though passion may have strained, it must not break our bonds of affection. The mystic chords of memory will swell when again touched, as surely they will be, by the better angels of our nature.

Example is not the main thing in influencing others. It is the only thing.

The true measure of a man is how he treats someone who can do him absolutely no good.

We may have different religions, different languages, different colored skin, but we all belong to one human race.

After your death you will be what you were before your birth.

Progress of mankind is progress of mind and intellect.