Everything is theoretically impossible, until it is done. One could write a history of science in reverse by assembling the solemn pronouncements of highest authority about what could not be done and could never happen.

Robert A. Heinlein

Robert A. Heinlein

doubters impossibility inspirational

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Be wary of strong drink, it can make you shoot at the tax collector...and miss.

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Always listen to experts. They'll tell you what can't be done and why. Then do it.

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Some people insist that 'mediocre' is better than 'best.' They delight in clipping wings because they themselves can't fly. They despise brains because they have none.

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The doubters said,
"Man can not fly,"
The doers said,
"Maybe, but we'll try,"
And finally soared
In the morning glow
While non-believers
Watched from below.

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Today's accomplishments were yesterday's impossibilities.

— Robert H. Schuller