There is something about health. Some people, out of frustration of ill-health, have prayed for death.
When you are not healthy, you don’t want to live. Nothing makes life exciting when there is no health.
The same thing goes for marriage, marriages can go sour and be sick.
The union between a man and a woman, no matter how well they started, can go bad if the principles of sound health in marriage are not highly maintained.
Just like the physical body, that you are healthy may not be automatic if you keep doing something that will jeopardize your health.