Unfortunately, there seems to be far more opportunity out there than ability.... We should remember that good fortune often happens when opportunity meets with preparation.

I have a peculiar theory about radium, and I believe it is the correct one. I believe that there is some mysterious ray pervading the universe that is fluorescing to it. In other words, that all its energy is not self-constructed but that there is a mysterious something in the atmosphere that scientists have not found that is drawing out those infinitesimal atoms and distributing them forcefully and indestructibly.

Many a person who could not comprehend Rousseau, and would be puzzled by Montesquieu, could understand Paine as an open book. He wrote with a clarity, a sharpness of outline and exactness of speech that even a schoolboy should be able to grasp.

Books will soon be obsolete in the schools... Our school system will be completely changed in the next ten years.

Time is really the only capital that any human being has, and the only thing he can't afford to lose.

A good idea is never lost. Even though its originator or possessor may die, it will someday be reborn in the mind of another.

Interest is the invention of Satan.