They are ill discoverers that think there is no land, when they can see nothing but sea.

What one man can invent another can discover.

I learned to make my mind large, as the universe is large, so that there is room for paradoxes.

The unknown is the largest need of the intellect.

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

The discovery of a new dish does more for human happiness than the discovery of a star.

How gloriously legible are the constellations of the heavens!

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

The atavistic urge toward danger persists and its satisfaction is called adventure.

What one man can invent another can discover.

Appearances are a glimpse of the obscure.

Science is a cemetery of dead ideas.

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