Science may set limits to knowledge, but should not set limits to imagination.

When I stand before God at the end of my life, I would hope that I would not have a single bit of talent left, and could say, 'I used everything you gave me'.

Good advice is always certain to be ignored, but that's no reason not to give it.

The experience gathered from books, though often valuable,is but the nature of learning whereas the experience gained from actual life is of the nature of wisdom.

One who loses wealth loses much. One who loses a friend loses more. But one who loses courage loses all.

Wonder is the beginning of wisdom.

The more skilled you are at something, the worse you are at it when showing someone.

If a man could have half of his wishes, he would double his troubles.

The most certain sign of wisdom is cheerfulness.

The first thing you'll have to do, is the last thing you wished.

The only real laughter comes from despair.

Promises are like crying babies in a theater, they should be carried out at once.

Doubt is the origin of wisdom

Never ruin an apology with an excuse.

None but ourselves can free our minds.

We may encounter many defeats but we must not be defeated.

He alone is free who lives with free consent under the entire guidance of reason.

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

Never put off for tomorrow, what you can do today.

There are no eternal facts, as there are no absolute truths.

Energy may be likened to the bending of a crossbow; decision,to the releasing of a trigger.