There is a quaint old theory that man may have two souls — a peripheral one which serves ordinarily, and a central one which is stirred only at certa… - O. Henry

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There is a quaint old theory that man may have two souls — a peripheral one which serves ordinarily, and a central one which is stirred only at certain times, but then with activity and vigour.
While under the domination of the former a man will shave, vote, pay taxes, give money to his family, buy subscription books and comport himself on the average plan.
But let the central soul suddenly become dominant, and he may, in the twinkling of an eye, turn upon the partner of his joys with furious execration; he may change his politics while you could snap your fingers; he may deal out deadly insult to his dearest friend; he may get him, instanter, to a monastery or a dance hall; he may elope, or hang himself — or he may write a song or poem, or kiss his wife unasked, or give his funds to the search of a microbe. Then the peripheral soul will return; and we have our safe, sane citizen again. It is but the revolt of the Ego against Order; and its effect is to shake up the atoms only that they may settle where they belong.