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

The possession of knowledge does not kill the sense of wonder and mystery. There is always more mystery.

When all else is lost, the future still remains.

If a window of opportunity appears, don't pull down the shade.

A little learning is a dangerous thing; Drink deep, or taste not the Pierian spring.

I know not age, nor weariness nor defeat.

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

You teach best what you most need to learn.

A physician without a knowledge of Astrology has no right to call himself a physician.

The smallest deed is better than the greatest intention.