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

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.

When your work speaks for itself, don't interrupt.

Do not let what you cannot do interfere with what you can do.

Sorry to interrupt myself, but it's the only way I stop talking.

The world is moving so fast these days that the man who says it can't be done is generally interrupted by someone doing it.

Never interrupt your opponent when he's destroying himself.

You're going to be much less likely to point the finger at somebody and create a huge brouhaha when it wasn't necessary if you had stopped and asked yourself, 'Could I have done things to prevent this situation?'

Gentlemen, when the enemy is committed to a mistake we must not interrupt him too soon.