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.

What one man can invent another can discover.

The unknown is the largest need of the intellect.

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

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.

Science is a cemetery of dead ideas.

The eternal mystery of the world is its comprehensibility.

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

There are truths that prove their discoverers witless.

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

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