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- Reason we call that faculty innate in us of discovering laws and applying them with thought. — Hermann von Helmholtz
- Now, the external work of man is of the most varied kind as regards the force or ease, the form and rapidity, of the motions used on it, and the kind of work produced. — Hermann von Helmholtz
- The law in question asserts, that the quantity of force which can be brought into action in the whole of Nature is unchangeable, and can neither be increased nor diminished. — Hermann von Helmholtz
- Not that I wish by any means to deny, that the mental life of individuals and peoples is also in conformity with law, as is the object of philosophical, philological, historical, moral, and social sciences to establish. — Hermann von Helmholtz
- A raised weight can produce work, but in doing so it must necessarily sink from its height, and, when it has fallen as deep as it can fall, its gravity remains as before, but it can no longer do work. — Hermann von Helmholtz
- But heat can also be produced by the friction of liquids, in which there could be no question of changes in structure, or of the liberation of latent heat. — Hermann von Helmholtz