"I hold it that a little rebellion, now and then, is a good thing, and as necessary in the political world as storms are in the physical. Unsuccessful rebellions, indeed, generally establish the encroachments on the rights of the people, which have produced them. An observation of this truth should render honest republican governors so mild in their punishment of rebellions, as not to discourage them too much. It is medicine necessary for the sound health of government."

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Trying to predict the future is a discouraging and hazardous occupation. If by some miracle a prophet could describe the future exactly as it was going to take place, his predictions would sound so absurd that people everyone would laugh him to scorn. The only thing we can be sure of about the future is that it will be absolutely fantastic. So, if what I say now seems to you to be very reasonable, then I will have failed completely. Only if what I tell you appears absolutely unbelievable have we any chance of visualizing the future as it really will happen.

— Arthur C. Clarke