For it is mutual trust, even more than mutual interest that holds human associations together. Our friends seldom profit us but they make us feel safe. We know, or think we know, exactly what they will do in any given situation. They take the hazard out of life and put in security. Marriage is a scheme to accomplish exactly that same end. A normal man does not marry a woman thinking of her as a possible enemy; he marries her thinking of her as a perpetual friend. He is not only willing to give her his full confidence, he is eager to do it. His delight in her is his complete merging of their interests, and, in so far as it is humanly possible, of their personalities...The essence of their relation lies in its merging of interests, hopes, fears, sorrows, triumphs, glories.