Romans 12
Living Sacrifices to God
I beseech you therefore, brethren, by the mercies of God, that you present your bodies a living sacrifice, holy, acceptable to God, which is your reasonable service. 2 And do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God.
The pattern of this world is sin.
1 John 2:3-6
3 Now by this we know that we know Him, if we keep His commandments. 4 He who says, “I know Him,” and does not keep His commandments, is a liar, and the truth is not in him. 5 But whoever keeps His word, truly the love of God is perfected in him. By this we know that we are in Him. 6 He who says he abides in Him ought himself also to walk just as He walked.
His commandments are His word.
1 John 1:5-6
5 This is the message which we have heard from Him and declare to you, that God is light and in Him is no darkness at all. 6 If we say that we have fellowship with Him, and walk in darkness, we lie and do not practice the truth.
Again, darkness is sin.
So from these passages we can see that:
1. We are called become a sacrifice that is holy (set apart) before God.
2. In order to do this we must keep His commands (His word)
3. But doing step one and two are useless if we are walking in darkness
So in reality we must first confess our sins, repent from them sincerely, keep His commands, and then we will become a living holy sacrifice unto God that is acceptable to Him and capable of being used by Him. When you do these steps that's when you will prove what is that good and perfect will of God.
Faith without fruits of the Holy Spirit in you is dead. The fruit of the spirit is love. And if what you love and worship isn't God then your faith is vain.