It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge.

Out of difficulties grow miracles.

The reward for work well done is the opportunity to do more.

Human behavior flows from three main sources: desire, emotion, and knowledge.

Learning too soon our limitations, we never learn our powers.

Where there is no vision, there is no hope.

Life is the art of drawing without an eraser.

Knowledge is power only if man knows what facts not to bother with.

Knowledge is the eye of desire and can become the pilot of the soul.

Having knowledge but lacking the power to express it clearly is no better than never having any ideas at all.