The thing I lose patience with the most is the clock. Its hands move too fast

Somewhere between the ages of eleven and fifteen, the average child begins to suffer from an atrophy, the paralysis of curiosity and the suspension of the power to observe. The trouble, I should judge, to lie with the schools.

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

Of all my inventions, I liked the phonograph best

Religion is all bunk.

The secret of success is focus of purpose.

I start where the last man left off. What the mind of man can conceive and believe, the mind of a man can achieve.