Quoting Charles H. Spurgeon:
My longing is that the churches may be more holy. I grieve to see so much of worldly conformity in believers. How often wealth leads men astray. How many Christians follow the fashion of this wicked world? We have among us avowed lovers of Christ, who act too much like “lovers of pleasure.” I charge you by the living God, do not profess to be followers of Christ, for He bids you come out from among them and be separate.
An unholy Church! It is useless to the world, and of no esteem among men. It is an abomination, hell’s laughter, and heaven’s abhorrence. The worst evils which have ever come upon the world have been brought upon her by an unholy Church. There cannot be faith in the heart unless there is holiness in the life!