Science is a cemetery of dead ideas.

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

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

There are truths that prove their discoverers witless.

Appearances are a glimpse of the obscure.

The eternal mystery of the world is its comprehensibility.

The unknown is the largest need of the intellect.

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

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

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