Genius is 99% perspiration and 1% inspiration.

Of the 200 light bulbs that didn't work, every failure told me something that I was able to incorporate into the next attempt.

What you are will show in what you do.

The successful person makes a habit of doing what the failing person doesn't like to do.

I am afraid of radium and polonium ... I don't want to monkey with them.

The man who doesn’t make up his mind to cultivate the habit of thinking misses the greatest pleasure in life.

If there is a better solution... find it.