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

The unknown is the largest need of the intellect.

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.

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

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

They are ill discoverers that think there is no land, when they can see nothing but sea.

How gloriously legible are the constellations of the heavens!

The discovery of a new dish does more for human happiness than the discovery of a star.

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