The real voyage of discovery consists not in seeking new landscapes, but in having new eyes.
As long as men are free to ask what they must, free to say what they think, free to think what they will, freedom can never be lost and science can never regress.
A doctor who doesn't say too many foolish things is a patient half-cured.
In theory one is aware that the earth revolves, but in practice one does not perceive it, the ground upon which one treads seems not to move, and one can live undisturbed. So it is with Time in one's life.
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