Clarified King James Bible (click on green text)
1 John 3:2-3

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 2 Beloved, now we are the sons of God, and it does not yet appear what we will be, but we know that when he appears, we will be like him, for we will see him as he is.

 3 And every man who has this hope in him purifies himself, even as He [Jesus] is pure.1 [the hope of seeing Jesus appear in your heart, is the hope that saves and purifies you. Blessed are the pure in heart for they shall see God. Mat 5:8. - Christ in you, the hope of glory. But you must have the hope for the power of God to be released to purify you. We must be righteous as He is righteous, 1 John 3:7. We must be perfect as our heavenly Father is perfect, Mat 5:48. We must be merciful as He is merciful, Luke 6:36. We must become pure as He is pure. 1 John 3:2-3. But as he who has called you is holy, so you be holy in all manner of conduct, 1 Pet 1:15. There is no flexibility and no equivocation in any of these stated requirements.]

Titus 2:13-14

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 13 Looking for that blessed hope, and the glorious appearing of the great God and our Savior Jesus Christ,

 14 Who gave himself for us, that he might redeem us from all iniquity [lawless deeds, sin], and purify for himself a peculiar people, zealous for good works. 1 [For we are His workmanship, created in Christ Jesus for good works, Eph 2:10.]

Acts 15:9

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 9 And put no difference between us and them, purifying their hearts by faith.1

1 Peter 1:22

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 22 Since you have purified your souls by obeying the truth through the Spirit to unfeigned love5 of the brothers, see that you love one another fervently with a pure heart;