Because everyone wants to leave out a part of God's message. "Just live by Faith" forgets that faith means faith in all of God. If they know that they can't be saved by works, then they discount works. if they know that faith without works is nothing, then they discount faith. If they know of the Holy Spirit putting the law in their hearts they discount that law is written for us. When law is Christ and law is love, then that is all they know. When there is a new covenant in Christ, then of course that is all there is, everything else is out of here. If they know the OT then the NT is nothing, and if they know the NT then the OT is nothing. That kind of thinking is wrong.
That is a globalized statement, "If they know that they can't be saved by works, then they discount works. if they know that faith without works is nothing, then they discount faith."
I believe a man is justified jointly by faith and works just as James said at James 2:24, just as you also do.
However, you choose to comply to the letter whereas I choose to comply to the spirit. The difference in the result may not be noticeably different in the immediate sense but it comes down to the fact that as the law of God is in me and a part of me I would find myself having to violate who I am in order for me to sin. (notice how that images God who cannot be untrue to who he is)
You think in such a fleshly manner that you are probably one who believes you cannot completely cease sinning while you are yet in this flesh. Am I right about that?
Because you are choosing to do it your way, you only need to violate a law outside yourself in order to sin.
Because you are doing it your way you are failing to put on incorruptibly in your spirit.
Because you think in a fleshly way you probably do not understand that right now is the opportune time, right now is the time to put off corruption and put on the incorruptible apparel of God. Today is the day of salvation. 2 Corinthians 6:2 "(For he saith, I have heard thee in a time accepted, and in the day of salvation have I succoured thee: behold, now is the accepted time; behold, now is the day of salvation.)"
Do you not realize that before Paul speaks what he does at 1 Corinthians 15:35-58 he first says, 1 Corinthians 15:34 "Awake to righteousness, and sin not; for some have not the knowledge of God: I speak this to your shame"?
Why is it that so many of you do not see that Paul is speaking there in the same fashion he did at Romans chapter 6?
We are to begin these things now with the help of Christ, first cleansing all corruption away from our spirit.
James 4:8 "Draw nigh to God, and he will draw nigh to you. Cleanse your hands, ye sinners; and purify your hearts, ye double minded."
Ephesians 5:25-27 "... Christ also loved the church, and gave himself for it; That he might sanctify and cleanse it with the washing of water by the word, That he might present it to himself a glorious church, not having spot, or wrinkle, or any such thing; but that it should be holy and without blemish."
2 Corinthians 7:1 "Having therefore these promises, dearly beloved, let us cleanse ourselves from all filthiness of the flesh and spirit, perfecting holiness in the fear of God."
Matthew 23:26 "Thou blind Pharisee, cleanse first that which is within the cup and platter, that the outside of them may be clean also."
You will never do that by your ritual observance of that Old Law which was given to convict you of sin.