"What I believe...about more sleep than is needful concerns the individual who goes far beyond the need, developing slothful and lazy habits, which deaden the senses and become a retarder of accomplishment. To overcome these things in life requires discipline and restraint."

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Insofar as he makes use of his healthy senses, man himself is the best and most exact scientific instrument possible. The greatest misfortune of modern physics is that its experiments have been set apart from man, as it were, physics refuses to recognize nature in anything not shown by artificial instruments, and even uses this as a measure of its accomplishments.

— Johann Wolfgang von Goethe