Why do we desire the spread of the gospel throughout the world? Not out of a sinful imperialism or triumphalism, whether for ourselves or the church or even 'Christianity.' Nor just because evangelism is part of our Christian obedience (though it is). Nor primarily to make other people happy (though it does). But especially because the glory of God and of His Christ is at stake. God is King, has inaugurated His saving reign through Christ, and has a right to rule in the lives of His creatures. Our ambition, then, is to seek first His kingdom, to cherish the passionate desire that His name should receive from men the honor which is due to it.
John Stott