Natural forces are measurable only in the form in which we know them, and the measure of their effect is energy.
Die Naturkräfte sind nur in der Form messbar, in der wir sie kennen, und das Mass ihrer Wirkung ist die Energie.
Psychologists
Hermann von Helmholtz
German physiologist-physicist (1821-1894). His 1847 paper formalised energy conservation; in 1849 he first measured nerve-impulse speed; in 1851 he invented the ophthalmoscope, reshaping perception.
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Hermann von Helmholtz's Other Quotes
Sensory perceptions are signs whose meaning it is the task of our understanding to learn.
Whoever, in the pursuit of science, seeks after immediate practical utility may rest assured that he seeks in vain.
The originator of a new concept finds, as a rule, that it is much more difficult to find out why other people do not understand him than it was to discover the new truth.