Every great improvement has come after repeated failures. Virtually nothing comes out right the first time. Failures, repeated failures, are finger posts on the road to achievement. One fails forward toward success.

Nothing ever built arose to touch the skies unless some man dreamed that it should, some man believed that it could, and some man willed that it must.

The typical eye sees the ten per cent bad of an idea and overlooks the ninety per cent good.

If I have had any success, it's due to luck, but I notice the harder I work, the luckier I get.

I am not interested in the past. I am interested in the future, for that is where I expect to spend the rest of my life.

A man must have a certain amount of intelligent ignorance to get anywhere.

Great steps in human progress are made by things that don't work the way philosophy thought they should. If things always worked the way they should, you could write the history of the world from now on. But they don't, and it is those deviations from the normal that make human progress.