To admit that you were wrong is an act of courage.

The purpose of Propaganda is to make one set of people forget that other sets of people are human.

Never complain of that of which it is at all times in your power to rid yourself.

If a man will begin with certainties, he shall end in doubts; but if he will be content to begin with doubts he shall end in certainties.

Our scientific power has outrun our spiritual power. We have guided missiles and misguided men.

You assist an evil system most effectively by obeying its orders and decrees. An evil system never deserves such allegiance. Allegiance to it means partaking of the evil. A good person will resist an evil system with his or her whole soul.

Don't let your ego get too close to your position, so that if your position gets shot down, your ego doesn't go with it.

Too many parents make life hard for their children by trying, too zealously, to make it easy for them.

The right man is the one who seizes the moment.

The heights by great men reached and kept Where not attained by sudden flight, But they, while their companions slept, Were toiling upward in the night.

Any man can make mistakes, but only an idiot persists in his error.

Knowledge rests not upon truth alone, but upon error also.

All men make mistakes, but a good man yields when he knows he knows his course is wrong and repairs the evil. The only crime is pride.

Mistakes are a fact of life. It is the response to error that counts.

There will be obstacles. There will be doubters. There will be mistakes. But with hard work, there are no limits.

Sometimes when you innovate, you make mistakes. It is best to admit them quickly, and get on with improving your other innovations.