God is happy. Perfectly, everlastingly happy. I Timothy 1:11 calls him “the blessed [happy] God.”
And if we want to be like Him, then we ought to be happy too! In biblical language, we ought to “rejoice in the Lord”! (Phil. 4:4). If we are to share His happiness, we must agree with Him perfectly in three ways: with His understanding, His delight, and His will.
God’s understanding is infinite and wise and perfect. His understanding of all things is truth. As R.C. Sproul eloquently put it, “Truth is that which corresponds to reality as perceived by God” (The Holiness of God, p. 240, emphasis mine). If you disagree with God, you are wrong. End of story. The believer’s goal should be to agree with God’s Word in all things. The believer prays, “I trust your wisdom,” and submits to God’s good hand in all things.
God’s will is good and righteous and perfect. In speaking of God’s will in this sense, I mean that which accords with His holy nature (not His foreordaining of all that comes to pass). His commandments in His Word are wise; and what is more, to the Christian, they are not grievous or burdensome. The believer prays, “Thy will be done,” and seeks to conform his life to God’s will in His Word. He prays, “I delight to do thy will, O my God” (Psalm 40:8), and happily follows Christ.
God’s delight is holy and satisfying and overflowing. The deepest delight of God the Father is His Son, Jesus Christ. He is God’s “beloved Son,” in whom God is “well pleased” (Matt. 3:17). The Son is the Father’s eternal delight (Prov. 4:30), and the Father is the Son’s eternal delight (Prov. 4:30). “Pleasures forevermore” are located at God’s right hand (Psalm 16:11), which is where Christ sat down after finishing His work on Calvary (Heb. 1:3). That shows that Christ is both experiencing the joys of God, and is Himself the location of the joys of God for all who look for joy. If in the persons of the Trinity there is delight and joy enough to satisfy the infinite heart of God, then God Himself is enough to satisfy the thirstiest Christian! The believer prays, “In your presence is fullness of joy,” and delights in Christ Himself – not merely in His gifts.
The believer longs to be like the One he worships – not identical, or being blended into Him so as to lose his personhood, but like Him in these three ways. The believer longs that whatever will he has might be in perfect accord with what God wills, that whatever delights he has might be in perfect agreement with God’s delights, and that his understanding and beliefs might be in perfect understanding with God’s mind.
If we were as fully like God as creatures can be, we would enjoy the same supreme, everlasting beatitude that God enjoys.