“ The saddest people I've ever met in life are the ones who don't care deeply about anything at all. Passion and satisfaction go hand in hand, and without them, any happiness is only temporary, because there's nothing to make it last. ”
Source: Dear John
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Those who have never known the deep intimacy and the intense companionship of happy mutual love have missed the best thing that life has to give. 
Someday, somewhere - anywhere, unfailingly, you'll find yourself, and that, and only that, can be the happiest or bitterest hour of your life. 
Love is that condition in which the happiness of another person is essential to your own. 
When someone loves you, the way they talk about you is different. You feel safe and comfortable. 
When one marriage partner tries to control the other, it shows a lack of real love. But when they express their love in continual thoughtfulness for the true happiness of the other, it becomes divine love 