The book says:
" If someone were to ask you, 'Why do you love your wife?' or 'Why do you love your husband?' --what would you say?
Most men mention their wife's beauty, her sense of humore, her kindness, her inner strength. They might talk about her cooking, her knack for decorating, or what a good mother she is.
Women would probably say something about their husband's good looks or his personality. They'd commend him for his steadiness and consistent character. They'd say they love him because he's always there for them. He's generous. He's helpful.
But what if over the course of years, your wife or husband stopped being every one of these things. Would you still love them? Based on your answers above, the only logical response would be 'no'. If your reasons for loving your spouse all have something to do with his or her qualities-and then those same qualities suddenly or gradually disappear-your basis for love is over.
The only way love can last a lifetime is if it's unconditional.