Appearances are a glimpse of the obscure.

The unknown is the largest need of the intellect.

The eternal mystery of the world is its comprehensibility.

Research is formalized curiosity. It is poking and prying with a purpose. 

What one man can invent another can discover.

A man of genius makes no mistakes. His errors are volitional and are the portals of discovery.

Nature has planted in our minds an insatiable desire to seek the truth.

What one man can invent another can discover.

How gloriously legible are the constellations of the heavens!

One sees great things from the valley; only small things from the peak.

There are truths that prove their discoverers witless.

True originality consists not in a new manner but in a new vision.

Every man takes the limits of his own field of vision for the limits of the world.