Holiness is a process of being cleaned form the inside by the washing of the Word, which is Jesus Christ.
like a bleeding wound cleanses it self through washing from the inside, so Christ washes us form the inside.
It is a deep washing and cleansing that man cannot do without the cross & the Spirit
9. How can a young man cleanse his way?
By taking heed according to Your word.
Psalm 119:9
30. But of Him you are in Christ Jesus, who became for us wisdom from God—and righteousness and sanctification and redemption—
1 Corinthians 1:30
13. But we are bound to give thanks to God always for you, brethren beloved by the Lord, because God from the beginning chose you for salvation through sanctification by the Spirit and belief in the truth,14. to which He called you by our gospel, for the obtaining of the glory of our Lord Jesus Christ.
2 Thessalonians 2:13-14
2. elect according to the foreknowledge of God the Father, in sanctification of the Spirit, for obedience and sprinkling of the blood of Jesus Christ:
Grace to you and peace be multiplied.
3. Blessed be the God and Father of our Lord Jesus Christ, who according to His abundant mercy has begotten us again to a living hope through the resurrection of Jesus Christ from the dead,4. to an inheritance incorruptible and undefiled and that does not fade away, reserved in heaven for you,5. who are kept by the power of God through faith for salvation ready to be revealed in the last time.
1 Peter 1:2-5