"Do you know that the words meditation and medicine come from the same root? Meditation is a kind of medicine; its use is only for the time being. Once you have learned the quality, then you need not do any particular meditation, then the meditation has to spread all over your life. Only when you are meditative twenty-four hours a day then can you attain, then you have attained. Even sleeping is meditation."

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The question of whether a device will come into being depends upon three things: first, whether there is a practical use for it that warrants its development and manufacturing costs; second, whether the laws of physics applying to the elements available for its design allow the attainment of the needed ranges, sensitivities, or the like; and third, whether the pertinent art of manufacture has advanced sufficiently to allow a useful embodiment to be built successfully.

— Vannevar Bush