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

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

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

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

The unknown is the largest need of the intellect.

The eternal mystery of the world is its comprehensibility.

What one man can invent another can discover.

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

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

One doesn’t discover new lands without consenting to lose sight of the shore for a very long time.