John Piper:
Can you imagine what it would be like if the God who ruled the world were not happy? What if God were given to grumbling and pouting and depression, like some Jack-and-the-beanstalk giant in the sky? What if God were frustrated and despondent and gloomy and dismal and discontented and dejected? Could we join David and say, “O God, you are my God; earnestly I seek you; my soul thirsts for you; my flesh faints for you, as in a dry and weary land where there is no water” (Psalm 63:1)?
I don’t think so. We would all relate to God like little children who have a frustrated, gloomy, dismal, discontented father. They can’t enjoy him. They can only try not to bother him, or maybe try to work for him to earn some little favor.
Therefore if God is not a happy God, Christian Hedonism has no foundation. For the aim of the Christian Hedonist is to be happy in God, to delight in God, to cherish and enjoy His fellowship and favor. But children cannot enjoy the fellowship of their Father if He is unhappy. Therefore the foundation of Christian Hedonism is the happiness of God.
But the foundation of the happiness of God is the sovereignty of God: “Our God is in the heavens; he does all that he pleases” (Psalm 115:3). If God were not sovereign, if the world He made were out of control, frustrating His design again and again, God would not be happy.
Just as our joy is based on the promise that God is strong enough and wise enough to make all things work together for our good, so God’s joy is based on that same sovereign control: He makes all things work together for His glory.
Desiring God (Colorado Springs, CO; Multnomah Books; 2003) p. 32-33.
(HT: The Cross Quoter)