XXXI. As long as the foot doth that which belongeth unto it to do, and the hand that which belongs unto it, their labour, whatsoever it be, is not unnatural. So a man as long as he doth that which is proper unto a man, his labour cannot be against nature; and if it be not against nature, then neither is it hurtful unto him. But if it were so that happiness did consist in pleasure: how came notorious robbers, impure abominable livers, parricides, and tyrants, in so large a measure to have their part of pleasures?