This inquiry seems to have been neglected for want of remembering that all action has its origin in the mind, and that therefore to suffer the thoughts to be vitiated, is to poison the fountains of morality: Irregular desires will produce licentious practices; what men allow themselves to wish they will soon believe, and will be at last incited to execute what they please themselves with contriving.
For this reason the casuists of the Romish church, who gain, by confession, great opportunities of knowing human nature, have generally determined that what it is a crime to do, it is a crime to think. Since by revolving with pleasure the facility, safety, or advantage of a wicked deed, a man soon begins to find his constancy relax, and his detestation soften; the happiness of success glittering before him, withdraws his attention from the atrociousness of the guilt, and acts are at last confidently perpetrated, of which the first conception only crept into the mind, disguised in pleasing complications, and permitted rather than invited.
No man has ever been drawn to crimes by love or jealousy, envy or hatred, but he can tell how easily he might at first have repelled the temptation, how readily his mind would have obeyed a call to any other object, and how weak his passion has been after some casual avocation, till he has recalled it again to his heart, and revived the viper by too warm a fondness.
Such, therefore, is the importance of keeping reason a constant guard over imagination, that we have otherwise no security for our own virtue, but may corrupt our hearts in the most recluse solitude, with more pernicious and tyrannical appetites and wishes than the commerce of the world will gene-
