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Those who say it can't be done are usually interrupted by others doing it.

Those who say, 'It can't be done,' are usually interrupted by others doing it.

People who say it cannot be done should not interrupt those who are doing it.

The time when you need to do something is when no one else is willing to do it, when people are saying it can't be done.

Never interrupt someone doing what you said couldn't be done.

By striving to do the impossible, man has always achieved what is possible. Those who have cautiously done no more than they believed possible have never taken a single step forward.

Those who get stuck doing the same things for too long are bound to get left behind the strong who press on and re-invent themselves.

I just don't think it's true that people can't do something else after they've done something that seems so permanent.

Nothing is ever done in this world until men are prepared to kill one another if it is not done.