Jonathan Edwards viewed heaven as a place where the joy of God's people will only increase forever and ever. (Sam Storms passionately unpacked this grand vision at our 2003 National Conference in his message "Joy's Eternal Increase: Edwards on the Beauty of Heaven.")
But why did Edwards think this? What will cause the saints' joy to constantly overflow and expand again and again into eternity? Edwards explains in Miscellanies #137:
The object of their thought shall be the glory of God; which they shall contemplate in the creation in general, in the wonderful make of it, particularly of the highest heavens, and in the wonders of God's providence. It shall most clearly and delightfully be manifested in the church of saints and angels; which they shall discover more and more by their conversation, assisting one another to discoveries in other things; and, most of all mediate ways, in the man Christ Jesus.
They shall employ themselves in singing God's praise, or expressing their thoughts to God and Christ, and also to one another; and in going from one part of heaven to another, to behold the glories of God shining in the various parts of it.