What is most wonderful of all, he is capable of increasing or diminishing his velocity of movement by the mysterious power he possesses by appropriating more or less energy from other substance, and turning it into motive energy.
 Nikola Tesla, The Problem of Increasing Human Energy (1900). copy citation

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Author Nikola Tesla
Source The Problem of Increasing Human Energy
Topic power energy
Date 1900
Language English
Reference The Problem of Increasing Human Energy with special references to the harnessing of the Sun's energy, in "Century Illustrated Magazine"
Note
Weblink https://en.wikisource.org/wiki/The_Problem_of_Increasing_Human_Energy

Context

“His mass, as the water in an ocean wave, is being continuously exchanged, new taking the place of the old. Not only this, but he grows propagates, and dies, thus altering his mass independently, both in bulk and density. What is most wonderful of all, he is capable of increasing or diminishing his velocity of movement by the mysterious power he possesses by appropriating more or less energy from other substance, and turning it into motive energy. But in any given moment we may ignore these slow changes and assume that human energy is measured by half the product of man's mass with the square of a certain hypothetical velocity. However we may compute this velocity, and whatever we may take as the standard of its measure, we must, in harmony with this conception, come to the conclusion that the great problem of science is, and always will be, to increase the energy thus defined.” source