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

What one man can invent another can discover.

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

Appearances are a glimpse of the obscure.

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

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

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.

How gloriously legible are the constellations of the heavens!

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