Worship propels us to mission. And our mission is to go and to make disciples (Matthew 28:19). We want others to find and know the same joy and peace that we experience in Christ. We want others to come and add their voices to the prayers and praise of God’s people. We are zealous of God’s glory and desire to see the glory of God fill the earth. And so we go and we tell.

When Isaiah worshipped God, in Isaiah 6, he saw the Lord high and lifted up; he saw his own sinfulness in the face of God’s glory and holiness; he experienced the wonder and joy of God’s forgiveness for his sins; and he responded to God’s call to go and preach God’s Word.

But Isaiah was given the difficult task of preaching to a people whose hearts were hard against truth. They were stubborn and would not listen. Isaiah was willing to be God’s messenger. We hear him say, “Here am I, send me.” But he longed to see the stirrings of faith and the fruits of repentance. When God told Isaiah that the people would turn away and not listen, the cry of his heart in verse 11 was “How long, O Lord?” He wanted the darkness and coldness of men’s hearts to end.

God did not leave Isaiah without hope. In response to his cry, God gives a promise at the end of chapter 6 of a remnant that would remain. Though it looks like the tree is cut down and the promise that God had made since the fall of Adam in the garden of a holy seed is in doubt; God declares at the end of verse 13: “The holy seed is its stump.” The rest of the book of Isaiah goes on to shed more light on God’s purposes in the preservation of Israel and the coming Messiah.

As you continue reading in Isaiah, it is as if God pulls back the curtain, providing more and more light, revealing what the Messiah will be and what He will accomplish. For example, we read later in Isaiah of the day when God’s praise will fill the earth:

From the ends of the earth we hear songs of praise,
of glory to the Righteous One (Isaiah 24:16).

Isaiah celebrated the day when God would shine the light of the gospel of Jesus.

Arise, shine, for your light has come,
and the glory of the LORD has risen upon you.
For behold, darkness shall cover the earth,
and thick darkness the peoples;
but the LORD will arise upon you,
and his glory will be seen upon you.
And nations shall come to your light,
and kings to the brightness of your rising (>Isaiah 60:1–3).

He looked forward to the day when the darkness would fall away and people from every nation, tongue, and tribe would see the light of Christ. He longed for the day when the glory of God would cover the earth.

This is another inner stirring of true worship. Worship cannot be contained in the sanctuary. Its desire is to fill the earth! You will know you have worshipped, when you leave this place and worship stays with you—you can’t leave it here! It continues to burn in your heart and engage your soul—so much so that you not only remember it—you must share it—you cannot contain it.

If you have ever experienced the glory of God and the joy of communing with Him in worship, you know that nothing else will ever satisfy your soul like God. We can never be satisfied with anything else. And we want this joy, not just for ourselves, but for others.

May God grant us a longing and a heart like Isaiah’s. May we be willing to go and to tell. And though our testimony may be to some a “fragrance from death to death” (2 Corinthians 2:16), may we never be resigned to see people turn away from God and perish in their sins. In the face of hardness and stubbornness and rejection, may the cry of our heart be: “How long O Lord?” It is God who commands light to shine out of darkness (2 Corinthians 4:6) and opens hearts (Acts 16:14). May He pour out His mercy and grace in our day.

Excerpt from a study on Isaiah 6: The Inward Reality of Worship.