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

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

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

What one man can invent another can discover.

The eternal mystery of the world is its comprehensibility.

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

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

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

The unknown is the largest need of the intellect.

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

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

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

Appearances are a glimpse of the obscure.