“Wherefore, beloved, seeing that ye look for such things, be diligent that ye may be found of him in peace, without spot, and blameless.” 2 Pet. 3:14
Blemish is a condition that disqualifies an animal as a sacrifice (Lev. 22:17-25) or a man from priestly service (Lev. 21:17-24). In the New Testament, Christ is the perfect sacrifice (without blemish, Heb. 9:14; 1 Pet. 1:19) intended to sanctify the church and remove all its blemishes (Eph. 5:27). The children of God are commanded to live lives without blemishes (Phil. 2:15; 2 Pet. 3:14). Need to get busy before it is too late? (Matt. 5:48) (1 Cor 1:8; 1 Thess. 5:23) See Heb. 12:14; 1 Pet. 1:15-16.
See article UNFINISHED BUSINESS which is the obtainment of the eternal body in which to serve Him forever.
Blamelessness and without spot is to be prior to heaven as taught in Phil. 2:15, in peace for He left us that way and we are to maintain that state prior to heaven according to John 14:27. And that wasn't all He left us for a little earlier in John He had referred to "the commandments that are Mine." In the next chapter He spoke of "the love that is Mine"; and a little later, "the joy that is Mine." (commandments, love and joy)
Christ left His Spirit John 14:26 to keep us in this blameless state by bringing to remembrance all that He said and what He meant by what He said. And we have the Advocate 1 John 2:1 whereby we are to confess what He has pointed out 1 John 1:9 thereby remaining in this state at peace John 14:27 with His Father and without spot. This is said to of Him whereby He is an active participant in this endeavor - co-dwelling in our bodies and teaching us truth concerning Himself. Rom. 12:1-2 - found to be metamorphosed.