We might even go further; we might plausibly maintain that every act performed by a citizen from his birth to his death injures his neighbours more or less indirectly. If he eats his dinner he diminishes the supply of food and raises the price. His very existence causes an enhanced demand for the necessaries of life; hence the cry against over-population. One who votes on the wrong side of a Parliamentary election injures all his fellow-countrymen. One who marries a girl loved by another injures that other. One who preaches Christianity or Agnosticism (if untrue) injures his hearers and their relatives and posterity. One who wins a game pains the loser. One who sells a horse for more than it is worth injures the purchaser, and one who sells it for less than it is worth injures his own family.