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.

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.

The eternal mystery of the world is its comprehensibility.

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

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

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

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

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