"Passion, though a bad regulator, is a powerful spring. Any absorbing passion has the effect to deliver from the little coils and cares of every day: 'tis the heat which sets our human atoms spinning, overcomes the friction of crossing thresholds, and first addresses in society, and gives us a good start and speed, easy to continue, when once it is begun."

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When one is working out a problem ... life becomes duality. One's ego transacts the ordinary routine of things, as if the mind had an upper and lower story and the regular performance of the day's duties moved and motivated on the upper floor, while down below the all-absorbing problem toils silently, forcefully, toward its solution.

— Alice Foote MacDougall