Cunning leads to knavery; it is but a step from one to the other, and that very slippery; lying only makes the difference; add that to cunning, and it is knavery.
There are cases in which a man would be ashamed not to have been imposed upon. There is a confidence necessary to human intercourse, and without which men are often more injured by their own suspicions than they would be by the perfidy of others.
A thorough-paced knave will rarely quarrel with one whom he can cheat; his revenge is plunder; therefore he is usually the most forgiving of beings, upon the principle that if he come to an open rupture, he must defend himself; and this does not suit a man whose vocation it is to keep his hands in the pocket of another.