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

The eternal mystery of the world is its comprehensibility.

Most new discoveries are suddenly-seen things that were always there.

The unknown is the largest need of the intellect.

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

There are truths that prove their discoverers witless.

Appearances are a glimpse of the obscure.

What one man can invent another can discover.

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

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