A Motive for Purity
1John 3:2,3 Dear friends, now we are children of God, and what we will be has not yet been made known. But we know that when he appears, we shall be like him, for we shall see him as he is. Everyone who has this hope in him purifies himself, just as he is pure.
Purity is characteristic to believers. Notice he's not making salvation contingent upon purity, but rather he's saying the those who have been born of God do purify themselves. Likewise, speaking from a view point of eternal security he says that we know that we Jesus appears we SHALL be like him. It's not that we might be like him if we're good enough. Those who don't believe eternal security don't believe the gospel and have no basis for the hope spoken of here, namely the anticipation of a future we have confidence in, as opposed to worldly hope which is mere wishful thinking. The motive for purity is not fear of condemnation but a joyful anticipation of becoming like Christ.
Paul, after speaking of scripture which promises, "I will be a Father to you, and you will be my sons and daughters, says the Lord Almighty", says, "Since we have these promises, dear friends, let us purify ourselves from everything that contaminates body and spirit, perfecting holiness out of reverence for God." 2Cor 7:1
Applications:
1.So if you want to be motivated to seek holiness, keep in mind your final destiny.
2. If a person isn't purifying themselves, that may be indicative that they don't believe.(In other words another indicator of whether one has been born of God is by whether they are purifying themselves) "Those who belong to Christ Jesus have crucified the sinful nature with its passions and desires." Ga 5:24