Man, a mere inhabitant of the earth, cannot overstep its boundaries! But though he is confined to its crust, he may penetrate into all its secrets.

The wisest man may be a blind father.

You cannot oppose reasoning to pride, the principal of all the vices, since, by its very nature, the proud man refuses to listen to it.

However strong, however imposing a ship may appear, it is not 'disgraced' because it flies before the tempest. A commander ought always to remember that a man's life is worth more than the mere satisfaction of his own pride. In any case, to be obstinate is blameable, and to be wilful is dangerous.

I repeat that 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.

Anything one man can imagine, other men can make real