The Sound Mind

Galatians 5:
22 But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness,
23 gentleness, self-control; against such things there is no law.
2Timothy 1:7 for God gave us a spirit not of fear but of power and love and self-control (soundness of mind). 

deilos
timid, that is, (by implication) faithless: - fearful.

The "fearful" are those who act in a powerless, unloving, and faithless way. Thus they have no control of themselves. "Self" rules their lives. This “spirit” does not come from God.

John 12:

42  Nevertheless, many even of the authorities believed in him, but for fear of the Pharisees they did not confess it, so that they would not be put out of the synagogue;

43  for they loved the glory that comes from man more than the glory that comes from God.

 

Proverbs 29:25  The fear of man lays a snare, but whoever trusts in the LORD is safe.

Sanctification: Separated Unto Him

Hebrews 10:
10 And by that will we have been sanctified through the offering of the body of Jesus Christ once for all……….. 

14 For by a single offering he has perfected for all time those who are being sanctified. 

Sanctification is not a "process". It is not a progressive improving of myself. It is not the working out of which Paul speaks in Philippians 2:12-13. It is not the good works we are predestined for. (Ephesians 2:10) All of these things the saints do as they have been both justified, (redeemed), and sanctified, (set apart), for these works.
Therefore, sanctification is simply defined as our being "set apart" in Christ, who is Himself set apart from all things.

Hebrews 7:
26 For it was indeed fitting that we should have such a high priest, holy, innocent, unstained, separated from sinners, and exalted above the heavens.
27 He has no need, like those high priests, to offer sacrifices daily, first for his own sins and then for those of the people, since he did this once for all when he offered up himself. 

John 17:
14 I have given them your word, and the world has hated them because they are not of the world, just as I am not of the world.
15 I do not ask that you take them out of the world, but that you keep them from the evil one.
16 They are not of the world, just as I am not of the world.
17 Sanctify them in the truth; your word is truth.
18 As you sent me into the world, so I have sent them into the world.
19 And for their sake I consecrate (sanctify; kjv) myself, that they also may be sanctified in truth.
20 "I do not ask for these only, but also for those who will believe in me through their word,
21 that they may all be one, just as you, Father, are in me, and I in you, that they also may be in us, so that the world may believe that you have sent me.

The Lord said "be holy (altogether separate) as I am holy (altogether separate)". He did not say be perfectly sinless, as I am perfectly sinless. He has perfected once for all and for all time those "being sanctified", that is those are elected (predestined to), and called to, justification and sanctification. Just as He is separate (sanctified) from all things in His own inherent perfection, He has perfected all who are His, to be sanctified from all things in Christ, in the world, but not part of it.
Once again, the scriptures do not speak of a process of improvement. The Savior needs no assistance in accomplishing that which for which He came. We are holy for the very reason that He has declared us to be so. As the song says; some days are diamonds, and some days are stones, some days we do better than others. However, Scripture tells us that for the saints, everyday is a day of growing in grace and knowledge of Him.

Hebrews 4:
14 Since then we have a great high priest who has passed through the heavens, Jesus, the Son of God, let us hold fast our confession.
15 For we do not have a high priest who is unable to sympathize with our weaknesses, but one who in every respect has been tempted as we are, yet without sin.
16 Let us then with confidence draw near to the throne of grace, that we may receive mercy and find grace to help in time of need. 

1Thess 5:
23 Now may the God of peace himself sanctify you completely, and may your whole spirit and soul and body be kept blameless at the coming of our Lord Jesus Christ.
24 He who calls you is faithful; he will surely do it. 

Philippians 1:6 And I am sure of this, that he who began a good work in you will bring it to completion at the day of Jesus Christ. 

Hebrews 9:
27 And just as it is appointed for man to die once, and after that comes judgment,
28 so Christ, having been offered once to bear the sins of many, will appear a second time, not to deal with sin but to save those who are eagerly waiting for him. 

Ephesians 1:
3 Blessed be the God and Father of our Lord Jesus Christ, who has blessed us in Christ with every spiritual blessing in the heavenly places,
4 even as he chose us in him before the foundation of the world, that we should be holy and blameless before him. In love
5 he predestined us for adoption as sons through Jesus Christ, according to the purpose of his will,
6 to the praise of his glorious grace, with which he has blessed us in the Beloved.
7 In him we have redemption through his blood, the forgiveness of our trespasses, according to the riches of his grace,
8 which he lavished upon us, in all wisdom and insight
9 making known to us the mystery of his will, according to his purpose, which he set forth in Christ
10 as a plan for the fullness of time, to unite all things in him, things in heaven and things on earth.
11 In him we have obtained an inheritance, having been predestined according to the purpose of him who works all things according to the counsel of his will,
12 so that we who were the first to hope in Christ might be to the praise of his glory.
13 In him you also, when you heard the word of truth, the gospel of your salvation, and believed in him, were sealed with the promised Holy Spirit,
14 who is the guarantee of our inheritance until we acquire possession of it, to the praise of his glory.

The Holy Spirit comes as the guarantor, i.e. earnest deposit, that all that Christ has fulfilled through his life, death, and resurrection will be consummated in time upon His return, at the “end”, of the end of the ages. He is not our guide to a “better us”. How much better does one need to be when one has already been freely justified, sanctified, and baptized into both His death and resurrection?
Fulfillment and consummation-
It is finished!

The Accusers: Psalm 109:29

Colossians 2:
13 And you, who were dead in your trespasses and the uncircumcision of your flesh, God made alive together with him, having forgiven us all our trespasses,14 by canceling the record of debt that stood against us with its legal demands. This he set aside, nailing it to the cross. 15 He disarmed the rulers and authorities and put them to open shame, by triumphing over them in him. 16 Therefore let no one pass judgment on you in questions of food and drink, or with regard to a festival or a new moon or a Sabbath. 17 These are a shadow of the things to come, but the substance belongs toChrist.18 Let no one disqualify you, insisting on asceticism and worship of angels, going on in detail about visions, puffed up without reason by his sensuous mind, (Habakkuk2:4) 19 and not holding fast to the Head, from whom the whole body, nourished and knit together through its joints and ligaments, grows with a growth that is from God. 20 If with Christ you died to the elemental spirits of the world, why, as if you were still alive in the world, do you submit to regulations—21 "Do not handle, Do not taste, Do not touch" 22 (referring to things that all perish as they are used)—according to human precepts and teachings? 

 The rulers and authorities of which Paul speaks of in THIS CONTEXT, are the neo-pharisees, i.e. the purveyors of legalism, the holiness brigade, those who preach a progressive sanctification, do all the right things or else, sinless perfection or bust; “church leadership” and their followers.Even those who claim “heavenly visions” demand an allegiance to their “revelation”.                                                                                                                      
Paul says they are "disarmed" by Christ. For those of us in Christ (the saints, those whom He has sanctified)there is no legal requirement that can be brought to bear against us. Christ accomplished it all and satisfies the righteous requirement of the law on our behalf. Christ has died, He has risen and has ascended to the right hand of the Father. Satan has been cast down. The enemy no longer stands before the throne as accuser of the brothers. (Rev 12:1-11; Job 1:6-12; the truth be told, Satan would no longer have to, as there are many who call themselves brothers who now do the job for him, and quite well I might add).
Paul spent a great amount of time in his calling as an apostle battling these types.
Christ, through His death and resurrection, disarmed them. They have no effective weapon to use against us who stand before the Lord in and through Christ (John 8:3-11).

 Isaiah 54:  (Isaiah also saw His day and rejoiced. John8:56-58) 
14 In righteousness you shall be established; you shall be far from oppression, for you shall not fear; and from terror, for it shall not come near you. 15 If anyone stirs up strife, it is not from me; whoever stirs up strife with you shall fall because of you.
(1 Timothy 1:1-11; Romans 14; all of the letter to the Galatians)

 16 Behold, I have created the smith who blows the fire of coals and produces a weapon for its purpose. I have also created the ravager to destroy;
(God is sovereign. He is creator of both weapon, and the makers of weaponry. He determines the purpose of both. All things serve Him; therefore………)

 17 no weapon that is fashioned against you shall succeed, and you shall refute every tongue that rises against you in judgment. This is the heritage of the servants of the LORD and their vindication from me, declares the LORD."
(So, He has purposed that those whom the Son has set free, are free indeed! John 8:34-36; Romans 6:11-18)

Galatians 2:4 Yet because of false brothers secretly brought in—who slipped in to spy out our freedom that we have in Christ Jesus, so that they might bring us into slavery—5 to them we did not yield in submission even for a moment, so that the truth of the gospel might be preserved for you. 

Anyone coming to you with the “gospel” of righteousness and sanctification, accomplished through our dead works, i.e. our freewill choices, (the trappings of our religious rituals and settings), as necessary additions to the Lord’s finished work is not bringing you “the good news” at all.
Solus Christus
Soli Deo Gloria