Appearances are a glimpse of the obscure.

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

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

The unknown is the largest need of the intellect.

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

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

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

The eternal mystery of the world is its comprehensibility.

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

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