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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.

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

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.

People can only do what they are ready to do when they are ready to do it.

I'm the kind of person that, if someone says, 'Oh yeah, you can't do that,' I want to then go do it.

I have found it advisable not to give too much heed to what people say when I am trying to accomplish something of consequence. Invariably they proclaim it can't be done. I deem that the very best time to make the effort.

One cannot violate the promptings of one's nature without having that nature recoil upon itself.

We should not underestimate the ability of people to do wrong if they want to do so.