We aim above the mark to hit the mark.

Knowledge rests not upon truth alone, but upon error also.

Education is the movement from darkness to light.

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

Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.

There are two ways of spreading light: to be the candle or the mirror that reflects it.

Knowledge is only one-half. Faith is the other.

Even the knowledge of my own fallibility cannot keep me from making mistakes. Only when I fall do I get up again.

There are three principal means of acquiring knowledge... observation of nature, reflection, and experimentation. Observation collects facts; reflection combines them; experimentation verifies the result of that combination.

I don't pretend we have all the answers. But the questions are certainly worth thinking about.