Kindness, on the other hand, glues couples together. Research independent from theirs has shown that kindness (along with emotional stability) is the most important predictor of satisfaction and stability in a marriage. Kindness makes each partner feel cared for, understood, and validated—loved.
A great deal of evidence shows that the more someone receives or witnesses kindness, the more they will be kind themselves, which leads to upward spirals of love and generosity in a relationship.
There are two ways to think about kindness. You can think about it as a fixed trait: Either you have it or you don’t. Or you could think of kindness as a muscle. In some people, that muscle is naturally stronger than in others, but it can grow stronger in everyone with exercise. Masters tend to think about kindness as a muscle. They know that they have to exercise it to keep it in shape. They know, in other words, that a good relationship requires sustained hard work.
Masters of Love
Science says lasting relationships come down to—you guessed it—kindness and generosity.
https://www.theatlantic.com/health/archive/2014/06/happily-ever-after/372573/
Thank you Tim Ferriss !
Majicman Notes 
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