Roughly, both the helps and the hindrances to married happiness can be lumped under one word—personalities. Temperament, mannerisms, tastes—all that is implied in the distinct individuality of each person—make up the chief source of the advantages and disadvantages with which the couple enter marriage. These traits cannot be changed overnight. Nor is it necessary, or at all wise, that they should be. John attracts Mary, and she appeals to him, because the personality of each one is what it is. Love has grown up between the two as a result of this personality attraction. And love is the motive that will make both try to keep open the pathway to marriage success.

But love is not a finished product that, once it comes, can forever after be trusted to keep its strength. Like everything else that is alive, it must be kept growing through exercise, or it wastes away.

Love gives the push that keeps a marriage moving, but it does not give the direction. That comes from understanding and cooperation. Although John and Mary love each other as feverishly as any other couple at first, if their loved is self-centered and ingrown, it will eventually turn to hate, or wear thin and give way to indifference. This is what they must guard against. While love is still the moving force of their lives, they must study the problems that are due to come. To wait until they are beset by them is to beg for trouble.

In order to cope with their problems they must realize, first, that they cannot stumble upon married happiness; that they must possess and cultivate a positive will to succeed. Then they must understand that the will is in itself not enough; it must be coupled with a willingness to work, and work hard, for the happiness that can be the greatest blessing of their lives. And finally, they must know what constitutes a happy marriage—what to aim for in their day-to-day association.

What makes a successful marriage? Here are nine guideposts to help John and Mary along their road:

1. The first requirement is the building of a union that is just to both.

The smaller issues on which this rests are the lively clashes of opposite desires, inevitable in the coming together of any two persons, intensified when those two persons are as different as a man and a woman, and unavoidable for two committed to a lifetime together in the close quarters of marriage.

2. Compromise will lift these essentially petty decisions of precedence above the level of selfishness.

Decisions must be made on the basis of what is good for both, not the selfish or narrow wish of either. The choice that brings the larger advantage to the two persons in their common role of marriage partners is the one to be made. Human judgment being as faulty as it is, time may show that any one decision has been an error, but there can be no ill will about it if each feels that an honest effort was made to be fair.

For example, Mary wants to buy a car, just as John is reckoning that the time has come to build a house. Or perhaps he wants to invest money in professional or business advancement at the precise moment when she realizes she wants a child. In either situation, the particular couple involved have to weigh delicately the effect on their joint enterprise of the conflicting courses of action. Much as Mary may crave a child or a car, she might not be able to enjoy either if she got it, unless John were ready to share in her delight. Nor could he, overruling her against her will, find in his choice of home-owning or personal-career investment the satisfaction he had expected. They two, and nobody else, can make the decision to fit their marriage.