The moment you take anything for granted, it loses its charm and you lose your perspective. Nothing is sure. In marriage you ought to live with the constant knowledge before you that if you do not work at marriage you may lose the one you love. No, it would make it more secure. If you had a job and knew you might lose it, you would work all the harder to keep it.
Marriage is a career in itself.
To succeed in any career you have to keep on working at it. The same thing is true of marriage. You must keep right on building it up just as you built its foundations. The minute you think your marriage is sure, that minute your marriage becomes most insecure. It is simply the line of least resistance for man.