Pleasures take to themselves wings and fly away; true knowledge remains forever.

All wish to possess knowledge, but few, comparatively speaking, are willing to pay the price.

A promise must never be broken.

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.