It's really useful to travel, if you want to see new things.

We were alone. Where, I could not say, hardly imagine. All was black, and such a dense black that, after some minutes, my eyes had not been able to discern even the faintest glimmer.

External objects produce decided effects upon the brain. A man shut up between four walls soon loses the power to associate words and ideas together. How many prisoners in solitary confinement become idiots, if not mad, for want of exercise for the thinking faculty!

If there were no thunder, men would have little fear of lightning.

Reality provides us with facts so romantic that imagination itself could add nothing to them.

Whatever one man is capable of imagining, other men will prove themselves capable of realizing.

The distance between the earth and her satellite is a mere trifle, and undeserving of serious consideration. I am convinced that before twenty years are over one-half of our earth will have paid a visit to the moon.