The first requisite of success is the ability to apply your physical and mental energies to one problem without growing weary.

I try not to invent things that people don't need.

There seems to be no limit to which some men will go to avoid the labor of thinking. Thinking is hard work.

Genius is 1 percent inspiration, 99 percent perspiration.

Work while others are wishing.

To those searching for truth -- not the truth of dogma and darkness but the truth brought by reason, search, examination, and inquiry, discipline is required. For faith, as well intentioned as it may be, must be built on facts, not fiction -- faith in fiction is a damnable false hope.

It is a terrible situation when the Government, to insure the National Wealth, must go in debt and submit to ruinous interest charges, at the hands of men, who control the fictitious value of gold. Interest is the invention of Satan.