I am very bad at expressing tender sentiments. The very word 'love' frightens me.

How tranquil is a coral tomb, and may the heavens grant that my companions and I be buried in no other!

I believe that water will one day be employed as fuel, that hydrogen and oxygen which constitute it, used singly or together, will furnish an inexhaustible source of heat and light, of an intensity of which coal is not capable.

Science, my boy, is composed of errors, but errors that it is right to make, for they lead step by step to the truth.

I can undertake and persevere even without hope of success.

In spite of the opinions of certain narrow-minded people who would shut up the human race upon this globe, we shall one day travel to the Moon, the planets, and the stars with the same facility, rapidity and certainty as we now make the ocean voyage from Liverpool to New York.

Great robbers always resemble honest folk. Fellows who have rascally faces have only one course to take, and that is to remain honest; otherwise, they would be arrested off-hand.