Though free to think and act, we are held together, like the stars in the firmament, with ties inseparable. These ties cannot be seen, but we can feel them.

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All matter comes from a primary substance, the luminiferous ether

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Our senses enable us to perceive only a minute portion of the outside world.

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Every effort under compulsion demands a sacrifice of energy. I never paid such a price.

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The day science begins to study non-physical phenomena, it will make more progress in one decade than in all the previous centuries of its existence.

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Love: I recognize the emotion for what it is, an irrational self-destructive impulse, which is disguised as joy.

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We all make mistakes, and it is better to make them before we begin.

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Of all the frictional resistances, the one that most retards human movement is ignorance.

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Electric power is everywhere present in unlimited quantities and can drive the world's machinery without the need of coal, oil, gas, or any other of the common fuels.

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Each day we go to our work in the hope of discovering.

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