When they shout “Long live progress,” always ask, “Progress of what?”

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

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

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

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

Appearances are a glimpse of the obscure.

One doesn’t discover new lands without consenting to lose sight of the shore for a very long time.

Science is a cemetery of dead ideas.

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

The unknown is the largest need of the intellect.