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

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.

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

Appearances are a glimpse of the obscure.

New things are always ugly.

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

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

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

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