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It is not that we live pure lives but rather that we know Him who is Pure that causes us to become pure.
For if by one man's offence death reigned by one; much more they which receive abundance of grace and of the gift of righteousness shall reign in life by one, Jesus Christ.) Romans 5:17

Because God is Pure and Holy those who seek Him and love Him, seek to purify their lives even as He is Pure.
Titus 2:12  Teaching us that, denying ungodliness and worldly lusts, we should live soberly, righteously, and godly, in this present world;
13  Looking for that blessed hope, and the glorious appearing of the great God and our Saviour Jesus Christ;
14  Who gave himself for us, that he might redeem us from all iniquity, and purify unto himself a peculiar people, zealous of good works.

We know this, when the day of the resurrection comes we will be raised pure and holy.
1 Corinthians 15:42  So also is the resurrection of the dead. It is sown in corruption; it is raised in incorruption:
43  It is sown in dishonour; it is raised in glory: it is sown in weakness; it is raised in power:
44  It is sown a natural body; it is raised a spiritual body. There is a natural body, and there is a spiritual body.

All those who have this hope of glory seek to purify their lives even as He is Pure.
1 John 3:2  Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is.
3  And every man that hath this hope in him purifieth himself, even as he is pure.

He shall purify!  He shall purify!
And he shall sit as a refiner and purifier of silver: and he shall purify the sons of Levi, and purge them as gold and silver, that they may offer unto the LORD an offering in righteousness. Malachi 3:3

By crucifying our own desires on the cross we die to our own corrupted wills and are raised into the incorruptible will of God.
¶Then said Jesus unto his disciples, If any man will come after me, let him deny himself, and take up his cross, and follow me. Matthew 16:24

By faith, the willingness to abandon our ways in favor of God's ways, we are purified and made holy.
Romans 3:22  Even the righteousness of God which is by faith of Jesus Christ unto all and upon all them that believe: for there is no difference:
23  For all have sinned, and come short of the glory of God;
24  Being justified freely by his grace through the redemption that is in Christ Jesus:
25  Whom God hath set forth to be a propitiation through faith in his blood, to declare his righteousness for the remission of sins that are past, through the forbearance of God;
26  To declare, I say, at this time his righteousness: that he might be just, and the justifier of him which believeth in Jesus.