For whom He did foreknow He also did predestinate to be conformed to the image of His Son… -Romans 8:29

Grace looks towards holiness, that there should be a people called forth to whom Christ should be the elder brother, the firstborn among many brethren. You certainly have not had the purpose of God fulfilled in you, dear friend, unless you have been conformed to the image of His dear Son. “He hath chosen us in Christ Jesus before the foundation of the world, that we should be holy and without blame before Him in love.” This is the aim of election; this is the object of redemption; this is the fruit of calling; this is the concomitant of justification; this is the evidence of adoption; this is the earnest of glory; that we should be holy, even as Christ is holy, and in this respect should wear the lineaments of the Son of God. He hath given His own Son to die for us, that we may die to sin; He has given Him to live that we may live like Him. In every one of us the Father desires to see Christ, that so Christ may be glorified in every one of us. Do you not feel this to be an imperative necessity to be laid upon you? Would you have the Lord miss His purpose? You are chosen of God to this end, that you should be “a chosen generation, a royal priesthood, a holy nation, a peculiar people, zealous of good works,” and what is this but that you should walk even as He walked?…The mystical body must be the most beautiful and precious production of God; for the church is Christ’s body, “the fulness of Him that filleth all in all.” And shall that mysterious fulness be something defiled, deformed, full of sin, subject to Satan? God forbid! “As He which hath called you is holy, so be ye holy,” and as your Head is holy, so be ye, as members of His body holy too. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/1732.cfm