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Only because you are under another Protestant illusion, that grace covers up rather than displaces sin. Luther invented that looking at a pile of manure. I, being Catholic, read the Hoyl Scripture instead.

This is how the process of santification really operates:

[2] Grace to you and peace be accomplished in the knowledge of God and of Christ Jesus our Lord: [3] As all things of his divine power which appertain to life and godliness, are given us, through the knowledge of him who hath called us by his own proper glory and virtue. [4] By whom he hath given us most great and precious promises: that by these you may be made partakers of the divine nature: flying the corruption of that concupiscence which is in the world. [5] And you, employing all care, minister in your faith, virtue; and in virtue, knowledge; [6] And in knowledge, abstinence; and in abstinence, patience; and in patience, godliness; [7] And in godliness, love of brotherhood; and in love of brotherhood, charity. [8] For if these things be with you and abound, they will make you to be neither empty nor unfruitful in the knowledge of our Lord Jesus Christ. [9] For he that hath not these things with him, is blind, and groping, having forgotten that he was purged from his old sins. [10] Wherefore, brethren, labour the more, that by good works you may make sure your calling and election. For doing these things, you shall not sin at any time. (2 Peter 1)

I know this is a bit longer than usual Protestant prooftexts, but I highlighted some parts for you to focus upon. And, for good measure:

[9] Know you not that the unjust shall not possess the kingdom of God? [...] [11] And such some of you were; but you are washed, but you are sanctified, but you are justified in the name of our Lord Jesus Christ, and the Spirit of our God (1 Cor 6)
may the God of peace himself sanctify you in all things; that your whole spirit, and soul, and body, may be preserved blameless (1 Thess. 5:23)