John Piper writes: “Worship is the only Christian activity which is an end in itself.”
There are many that believe worship is to prepare peoples' hearts to receive the teaching of the Word. While that is a benefit, that isn't its purpose. Don't confuse the two. The purpose of worship is... worship.
Take a moment and think about eternity. What is the one Christian activity that will continue? Is it evangelism? It is discipleship? Is it teaching? Among all the things that we do in our lives as believers, the one thing we do that will remain throughout eternity is our worship of God.
Scripture makes many declarations that worship will continue forever. In fact, it is the only Christian activity that has that distinction. Consider these few examples:
"Blessed be the name of the Lord now and forever." Ps 113:2
"I will praise the Lord,
And may everyone on earth bless His holy name forever and ever." Ps 145:21
"All glory to Him, both now and forever! Amen." 2 Peter 3:18b
“Amen! Blessing and glory and wisdom and thanksgiving and honor and power and strength belong to our God forever and ever! Amen.” Rev 7:12
If we look at all of our Christian activities as service to God, most of them serve God through our service to others. Worship, however, is service to God, period. Consider for a moment that you're stranded on a desert island with no human contact. The only thing that you can do to serve God is to serve Him through your worship. There is no one else to serve. But you can worship.
When we reach our home in heaven, all other acts of service will cease. At that point there will be no need for those things to continue. But our worship of our God will never end.
So, the take-away is this: every other spiritual endeavor—evangelism, edification, teaching, disciple-making, etc.—should result in the development of more and better worshipers. That is our eternal goal.
I'll leave you with this advice from Brother Lawrence, author of The Practice of the Presence of God: “The end we ought to propose to ourselves is to become, in this life, the most perfect worshipers of God we can possibly be, as we hope to be through all eternity.”