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

I am tormented with an everlasting itch for things remote. I love to sail forbidden seas and land on barbarous coasts.

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

Appearances are a glimpse of the obscure.

What one man can invent another can discover.

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

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

How gloriously legible are the constellations of the heavens!

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

The unknown is the largest need of the intellect.