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Alternate currents, especially of high frequencies, pass with astonishing freedom through even slightly rarefied gases. The upper strata of the air are rarefied. To reach a number of miles out into space requires the overcoming of difficulties of a merely mechanical nature.

— Nikola Tesla

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More quotes by Nikola Tesla

Let the future tell the truth and evaluate each one according to his work and accomplishments. The present is theirs; the future, for which I really worked, is mine.

Ere many generations pass, our machinery will be driven by a power obtainable at any point of the universe.

Money does not represent such a value as men have placed upon it. All my money has been invested into experiments with which I have made new discoveries enabling mankind to have a little easier life.

Today's scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality.

I have harnessed the cosmic rays and caused them to operate a motive device.

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Attribution

Quote text and notes from Wikiquote: Nikola Tesla (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.