If you think your teacher is tough, wait until you get a boss. He doesn't have tenure.

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

Real success can only come if there is a change in our societies and in our economics and in our politics.

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

Few things are impossible to diligence and skill. Great works are performed not by strength, but perseverance.

What one has to do usually can be done.

Any fact facing us is not as important as our attitude toward it, for that determines our success or failure

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

Listen if you want to be heard

Price is what you pay. Value is what you get.

The production of too many useful things results in too many useless people.

Eighty percent of success is showing up.

You can observe a lot just by watching.

Lisa, if you don't like your job you don't strike. You just go in every day and do it really half-assed. That's the American way.

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

There is nothing impossible to him who will try.

To solve any problem, here are three questions to ask yourself: First, what could I do? Second, what could I read? And third, who could I ask?

Only you can control your future.

Success is steady progress toward one's personal goals

Anticipate the difficult by managing the easy

The best way to destroy an enemy is to make him a friend.