Show me a completely contented person and I'll show you a failure.

I make more mistakes than anyone else I know, and sooner or later, I patent most of them.

Discontent is the first necessity of progress.

It has been just so in all my inventions. The first step is an intuition-and comes with a burst, then difficulties arise. This thing that gives out and then that-"Bugs"as such little faults and difficulties are called show themselves and months of anxious watching, study and labor are requisite before commercial success-or failure-is certainly reached.

Genius is 99% perspiration and 1% inspiration.

I know this world is ruled by Infinite Intelligence. It required Infinite Intelligence to create it and it requires Infinite Intelligence to keep it on its course ... It is mathematical in its precision.

It is the best book ever written on the subject. There is nothing like it!