The bulk of the world's knowledge is an imaginary construction. History is but a mode of imagining, of making us see civilizations that no longer appear upon the earth. Some of the most significant discoveries in modern science owe their origin to the imagination of men who had neither accurate knowledge nor exact instruments to demonstrate their beliefs. If astronomy had not kept always in advance of the telescope, no one would ever have thought a telescope worth making. What great invention has not existed in the inventor's mind long before he gave it tangible shape?

I cannot see the lovely things with my eyes, but my mind can see them all, and so I am joyful all the day long.

It is so pleasant to learn about new things. Every day I find how little I know, but I do not feel discouraged since God has given me an eternity in which to learn more.