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The deep happiness that marriage can bring, then, lies on the far side of sacrificial service in the power of the Spirit. That is, you only discover your own happiness after each of you has put the happiness of your spouse ahead of your own, in a sustained way, in response to what Jesus has done for you. Some will ask, “If I put the happiness of my spouse ahead of my own needs—then what do I get out of it?” The answer is—happiness. That is what you get, but a happiness through serving others instead of using them, a happiness that won’t be bad for you. It is the joy that comes from giving joy, from loving another person in a costly way.
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Timothy J. Keller (The Meaning of Marriage: Facing the Complexities of Commitment with the Wisdom of God)