Authors:

If husbands could realize what large returns of profit may be gotten out of a wife by a small word of praise paid over the counter when the market is just right, they would bring matters around the way they wish them much oftener than they usually do. Arguments are unsafe with wives, because they examine them; but they do not examine compliments. One can pass upon a wife a compliment that is three-fourths base

Mark Twain (1966). “Mark Twain's Satires and Burlesques”, p.185, Univ of California Press
If husbands could realize what large returns of profit may be gotten out of a wife by a small word of praise paid over the counter when the market is just right, they would bring matters around the way they wish them