"When conscious activity is wholly concentrated on some one definite purpose, the ultimate result, for most people, is lack of balance accompanied by some form of nervous disorder."

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They whose activity of imagination is often shifting the scenes of expectation, are frequently subject to such sallies of caprice as make all their actions fortuitous, destroy the value of their friendship, obstruct the efficacy of their virtues, and set them below the meanest of those who persist in their resolutions, execute what they design, and perform what they have promised.

— Samuel Johnson