Science, my lad, is made up of mistakes, but they are mistakes which it is useful to make, because they lead little by little to the truth.

The human mind delights in grand conceptions of supernatural beings.

[we see that] science is eminently perfectible, and that each theory has constantly to give way to a fresh one.

With time and thought, one can do a good job.

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.

It is certain," exclaimed my uncle in a tone of triumph. "But silence, do you hear me? silence upon the whole subject; and let no one get before us in this design of discovering the centre of the earth.

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