All our knowledge begins with the senses, proceeds then to the understanding, and ends with reason. There is nothing higher than reason.

There is a wisdom of the head, and... there is a wisdom of the heart.

One new feature or fresh take can change everything.

Knowing is not enough, we must apply. Willing is not enough, we must do.

Everybody is ignorant, only on different subjects.

Never do anything when you are in a temper, for you will do everything wrong.

Unfortunately, the clock is ticking, the hours are going by. The past increases, the future recedes. Possibilities decreasing, regrets mounting.

You can be rich in spirit, kindness, love and all those things that you can't put a dollar sign on.

One of the truest tests of integrity is its blunt refusal to be compromised.

The secret of life, though, is to fall seven times and to get up eight times.

Courage, above all things, is the first quality of a warrior.

If you only read the books that everyone else is reading, you can only think what everyone else is thinking.

Experience teaches us that it is much easier to prevent an enemy from posting themselves than it is to dislodge them after they have got possession.

Above all be of single aim; have a legitimate and useful purpose, and devote yourself unreservedly to it.

But the fact that some geniuses were laughed at does not imply that all who are laughed at are geniuses. They laughed at Columbus, they laughed at Fulton, they laughed at the Wright brothers. But they also laughed at Bozo the Clown.

If you do not know the laws of right conduct, you cannot form your character.

The only limit to our realization of tomorrow will be our doubts of today.

Medicine heals diseases of the body, wisdom frees the soul from passions.

It is hard to fight desire; but to control it is the sign of a reasonable man.

Stupidity is a talent for misconception.

I wanted to change the world. But I have found that the only thing one can be sure of changing is oneself.