Here are just a few of many wonderful verses from the Psalms. I recommend that you work through the Psalms and write such verses on 3×5 cards and read them over each day to find your joy in God.
Psalm 5:11-12: But let all who take refuge in You be glad, let them ever sing for joy; and may You shelter them, that those who love Your name may exult in You. For it is You who blesses the righteous man, O Lord, You surround him with favor as with a shield.
Psalm 9:1-2: I will give thanks to the Lord with all my heart; I will tell of all Your wonders. I will be glad and exult in You; I will sing praise to Your name, O Most High.
Psalm 16:11: You will make known to me the path of life; in Your presence is fullness of joy; in Your right hand there are pleasures forever.
Psalm 27:4: One thing I have asked from the Lord, that I shall seek: that I may dwell in the house of the Lord all the days of my life, to behold the beauty of the Lord and to meditate in His temple.
Psalm 31:19: How great is Your goodness, which You have stored up for those who fear You, which You have wrought for those who take refuge in You before the sons of men!
Psalm 32:11: Be glad in the Lord and rejoice, you righteous ones; and shout for joy all you who are upright in heart.
Psalm 33:1: Sing for joy in the Lord, O you righteous ones; praise is becoming to the upright.
Psalm 34:8: O taste and see that the Lord is good; how blessed is the man who takes refuge in Him!
Psalm 36:7-9: How precious is Your lovingkindness, O God! And the children of men take refuge in the shadow of Your wings. They drink their fill of the abundance of Your house; and You give them to drink of the river of Your delights. For with You is the fountain of life; in Your light we see light.
Here are a few quotes from Jonathan Edwards (and one from John Piper) on being delighted in God (taken from John Piper, The Dangerous Duty of Delight [Multnomah Publishers], page numbers from Piper).
Jonathan Edwards: “The happiness of the creature consists in rejoicing in God, by which also God is magnified and exalted.” (p. 13)
Jonathan Edwards: “The end of the creation is that the creation might glorify [God]. Now what is glorifying God, but a rejoicing at that glory he has displayed?” (p. 13)
Jonathan Edwards: “God is glorified not only by His glory’s being seen, but by its being rejoiced in. When those that see it delight in it, God is more glorified than if they only see it. His glory is then received by the whole soul, both by the understanding and by the heart. God made the world that He might communicate, and the creature receive, His glory; and that it might [be] received both by the mind and by the heart. He that testifies his idea of God’s glory [doesn’t] glorify God so much as he that testifies also his … delight in it.” (p. 19)
John Piper: “God is most glorified in us when we are most satisfied in Him.” (p. 21)