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.

The greatest invention in the world is the mind of a child.

People are not remembered by how few times they fail, but by how often they succeed. Every wrong step is another step forward

I never once failed at making a light bulb. I just found out 99 ways not to make one.

Sleep is like a drug. Take too much at a time and it makes you dopey. You lose time and opportunities.

A reporter called on Edison to interview him about a substitute for lead in the manufacture of storage batteries that the scientist was seeking. Edison informed the man that he had made 20,000 experiments but none had worked. "Aren't you discouraged by all this waste of effort?" the reporter asked. Edison: "Waste! There's nothing wasted. I have discovered 20,000 things that won't work."

Genius is not inspired. Inspiration is perspiration.