As Thou hast sent Me into the world, even so have I also sent them into the world.- John 17:18

When a church is not serving God, mischief is brewing withing herself. While she is not bringing others in, her own heart is becoming weak in its pulsations, and her entire constitution is a prey to decline. The church must either bring forth children unto God, or else die of consumption: she has no alternative but that. A church must either be fruitful or rot, and of all things, a rotting church is the most offensive. Would God we could bury our dead churches out of our sight, as Abraham buried Sarah, for above ground they breed a pestilence of scepticism; for men say, “Is this religion?” and taking it to be so, they forego true religion altogether.

And then, worst of all is, God is not glorified. If there be no yearning of heart in the church, and no conversions, where is the travail of the Redeemer’s soul? Where, Immanuel, where are the trophies of Thy terrible conflict? Where are the jewels for Thy crown? Thou shalt have Thine own, Thy Father’s will shall not be frustrated; Thou shalt be adored; but as yet we see it not. Hard are men’s hearts, and they will not love Thee; unyielding are their wills, and they will not own Thy sovereignty. Oh! weep because Jesus is not honored. The foul oath still curdles our blood as we hear it, and blasphemy usurps the place of grateful song. Oh! by the wounds and bloody sweat, by the cross and nails, and spear, I beseech you followers of Christ, be in earnest, that Jesus Christ’s name may be known and loved through the earnest agonizing endeavors of the Christian church. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1009.cfm