Behold, He who keeps Israel shall neither slumber nor sleep. -Psalm 121:4

A dead church is a reeking Golgotha, a breeding-place of evils, a home of devils. The tombs may be newly whitewashed, but they are none the less open sepulchres, haunts of unclean spirits. A church all alive is a little heaven, the resort of angels, the temple of the Holy Ghost. In some of our churches everybody seems to be a little colder than everybody else. The members are holy icicles. A general frost has paralyzed everybody; and though some are colder than others, yet all are below zero. There are no flowing rills of refreshment, but everything is bound hard and fast with the frost of indifference. Oh, that the Lord would send forth His wind, and melt the glaciers! Oh, that the Spirit of God would chase winter out of every heart and every church! No human power can keep a church from the frostbite which numbs and kills. Except the Lord be there, growth, life, warmth-are all impossible. Ye that make mention of the Lord, keep not silence, and give Him no rest, but cry day and night to Him! O Lord, abide with us. Go forth with our armies. Make us to be the living children of the living God!”

Who is to keep the church pure? None but God Himself. If the Lord is there, holiness will abound, and fruits of the Spirit will be seen on all sides; but if the Lord be once withdrawn, then flesh and blood will rule, and gender towards corruption after its own manner; and the church will become a synagogue of formalists. Pray, my brethren, continually, that the Lord may dwell in our Zion, to maintain us in all holy obedience and purity of life.~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2182.cfm