The greatest of all mistakes is to do nothing because you think you can only do a little

You always admire what you really don't understand.

Man is the only creature who refuses to be what he is.

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

Do not reveal what you have thought upon doing, but by wise council keep it secret being determined to carry it into execution.

A good teacher protects his pupils from his own influence.

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.

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

Each day is a little life; every waking and rising a little birth; every fresh morning a little youth; every going to rest and sleep a little death.

What lies behind us and what lies ahead of us are tiny matters compared to what lives within us.

Drop the idea of becoming someone, because you are already a masterpiece. You cannot be improved. You have only to come to it, to know it, to realize it.

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

The wise man should restrain his senses like the crane and accomplish his purpose with due knowledge of his place, time and ability.

What a man does for others, not what they do for him, gives him immortality.

A mistake is always forgivable, rarely excusable and always unacceptable.

Wonder is the beginning of wisdom.

Kind words don't cost much. Yet they accomplish much.

One just needs a little alertness to see and find out: Life is really a great cosmic laughter.

The most certain sign of wisdom is cheerfulness.

Yesterday is but today's memory and tomorrow is today's dream.

To be wronged is nothing unless you continue to remember it.