Sin is the transgression of Law 1 John 3:4
For we know that the law is spiritual: but I(man) am carnal, sold under sin. Rom 7: 14
Carnal mind is not subject to the Law of God; Rom 8:7
For to be carnally minded is death; but to be spiritually minded is life and peace. Rom 8:6
If we confess our sins, he is faithful and just to forgive us our sins, and to cleanse us from all unrighteousness. 1 John 1:9
Jesus not only forgives (justification) our sins but also cleanse us (sanctification) from all unrighteousness
Some Powerful promises to remember
==================================
Now unto him that is able to keep you from falling, and to present you faultless before the presence of his glory with exceeding joy, Jud 24
Whosoever is born of God doth not commit sin; for his seed remaineth in him: and he cannot sin, because he is born of God. 1 John 3:9
Wherefore the rather, brethren, give diligence to make your calling and election sure: for if ye do these things, ye shall never fall: 2 Pet 2:10
Christ promises a crown to everyone who overcomes sin.
To him that overcometh will I grant to sit with me in my throne, even as I also overcame, and am set down with my Father in his throne Rev 3:21
Adventist Apology Site 