John MacArthur is writing a series on why he loves the church, and I found this paragraph to be so significant for me:
It is impossible to overstate the importance of the church in the eternal plan of God. The church is His building (1 Cor. 3:9). Moreover, He is the immutable, sovereign, omnipotent Lord of heaven. His Word cannot return void but always accomplishes what He says (Isa. 55:11). He is always faithful and cannot deny Himself (2 Tim. 2:13). His sovereign purposes always comes to pass, and His will is always ultimately fulfilled (Isa. 46:10). His plan is invincible and unshakable, and He will bring to pass all that He has spoken (v. 11). And he has spoken about building the church in the most triumphant words.
This means that the church is Jesus' church and not mine. That is, even with my flaws and sins, my weaknesses in leadership and teaching and shepherding, I cannot mess up His church and its mission. It's Jesus' church and these words are so comforting. Of course, this doesn't mean that I have no role to play or no responsibility over how I lead and minister. But I always know that He will bring His church to completion and the salvation of His people is not in my hands. And that is really really good news for me and the church.