"Thy words were found, and I did eat them; and thy word was unto me the joy and rejoicing of mine heart: for I am called by thy name, O LORD God of hosts." (Jeremiah:15:16)
People today seem always to be looking for fun or entertainment, but it is significant that "fun" is never mentioned in the Bible, so it is evidently not considered to be a very significant part of the Christian life. The word "entertain" is used to speak of hospitality, and such activities as "play" and "reveling" only receive condemnation. ("Playing" is appropriate for children and animals, of course.)
Christians, however, have something far better than worldly fun--they have heavenly joy! This is the unique privilege of the redeemed, and there are many channels through which this joy can be experienced.
First of all, Christian joy comes through the Word. As even Jeremiah ("the weeping prophet!") could say: "Thy word was unto me the joy and rejoicing of mine heart," as in our text. Then we rejoice in God’s great salvation: "I will greatly rejoice in the LORD, my soul shall be joyful in my God; for he hath clothed me with the garments of salvation" (Isaiah:61:10).
--Henry M. Morris