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

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

What one man can invent another can discover.

There are truths that prove their discoverers witless.

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

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

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

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

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

How gloriously legible are the constellations of the heavens!