Do one thing at a time, and while doing it put your whole soul into it to the exclusion of all else.

You reach a point where you don't work for money.

One of the main weaknesses of mankind is the average man's familiarity with the word 'impossible'.

Art calls for complete mastery of techniques, developed by reflection within the soul.

When asked, 'How do you write?' I invariably answer, 'one word at a time.'

This is the real secret of life - to be completely engaged with what you are doing in the here and now. And instead of calling it work, realize it is play.

To know what people really think, pay regard to what they do, rather than what they say.

When inspiration does not come to me, I go halfway to meet it.

There is little success where there is little laughter.

Only you can control your future.

Results! Why, man, I have gotten a lot of results. I know several thousand things that won't work.

One of the greatest discoveries a person makes, one of their great surprises, is to find they can do what they were afraid they couldn't do.

From each according to his abilities, to each according to his needs.

Talent hits a target no one else can hit; Genius hits a target no one else can see.

Just because something doesn't do what you planned it to do doesn't mean it's useless.

Chop your own wood and it will warm you twice

He who thinks little errs much

Old Professors never die, they just lose their faculties.

Without a sense of urgency, desire loses its value.

There is nothing more difficult to carry out, nor more doubtful of success, nor more dangerous to handle, that to institute a new order of things

Dad, you've done a lot of great things, but you're a very old man, and old people are useless.