The most important affair in life is the choice of a calling; chance decides it. Custom makes men masons, soldiers, slaters. ...We choose our callings according as we hear this or that praised or despised in our childhood, for we naturally love truth and hate folly. ...It is custom then which... constrains nature. But sometimes nature gains the ascendancy, and preserves man's instinct, in spite of all custom, good or bad.

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