Here is an interesting portion of scripture. It shows how there is no tension in biblical instruction and admonishing.
16 Rejoice always,
17 pray without ceasing,
18 give thanks in all circumstances; for this is the will of God in Christ Jesus for you.
19 Do not quench the Spirit.
20 Do not despise prophecies,
21 but test everything; hold fast what is good.
22 Abstain from every form of evil.
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. - 1 Thessalonians 5:16-24
I do not rejoice always if I am honest. Does this place my salvation in jeopardy? Right now I am typing not praying, so easily I can say I do not pray without ceasing. I have never even witnessed this in anyone, ever. I know of times where I was asking God why and not giving Him thanks. Yes in my selfishness suffering from the pain of a broken bone or morning over the death of a loved one, I was not thanking God. I can not honestly say I abstain from all evil, thinking of coveting, or sins of omission, vanity, pride. Yet I can say not in every situation do I fail responding as instructed, and if you were to look at the whole of my life, more importantly after I was born from above, I more reflect the positive than the negative. What then is happening here in this text? Paul is admonishing and encouraging the children of God.
I would like everyone to meditate on verse 23 and 24.
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. - 1 Thessalonians 5:23-24
Those who never or seldom pray, fear the Lord. Those who hate to rejoice at another's success or in the face of adversity, check your faith that God is in control. Those who do not thank God for their circumstances are likely thanking themselves be it good or bad their current situation.
In all of this though it is God who sanctifies you, not that you could keep yourselves. Yet without the fruit of the Spirit, there is not evidence of the Spirt. What then are you believing in is what I would question. Where is your faith, and in whome does it reside? Because He who calls is faithful! He will complete what He begins! His children will all be accounted for at the consummation of all things, for He knows who are His and they will be kept blameless. Is santification synergistic? Yes without question, yet this is not what brings about salvation. God brings about salvation through our response of faith in the gospel of Jesus Christ. We are to cooperate with the santification, this not quenching the Spirit. This is the call and fulfillment of love that is intrensic in the biblical message. This is the fruit of the Spirit. Love is a choice and an action. This living of love is not an option for the child of God, but is the natural outpouring of the Holy Spirit. As the Christian matures in his/her walk, this choice becomes easier and more evident, as she/he puts on Christ.
Where the debate begins is if salvation is synergistic. I argue it is not. I argue salvation is an act of God. Salvation is a miracle in action for all who receive it. I argue salvation glorifies God and His great name and He is desevernt of full credit. Not partial credit because of my good behavior or good decision making. Salvation screams out God is merciful, because we all deserve His wrath fully to the dregs. All of us except Him who did bear His wrath fully, who took on the sins of the world, and is the propitiation. He who knew no sin, took on sin. Praise and thanks be to the risen Lamb, He who is worthy to open the scroll and break the seals, so as to dispense His wrath. Onto Him has been given judgement, and His judgment is righteous and true.
What then about the admonishing and exhortation? Why even do it if you are either saved or not saved, if you have no choice in the matter? Because God is good and holy and He calls everyone to repentance. Because God is just and will judge everyone based on what they have done be it good or bad. Because we are made in His image, and reflecting evil in any form is sinning against a righteous and holy God. Because by doing so, admonishing and exhorting, we bring glory and honor to God. Because we live in a fallen world where sin abounds and we are called to be a city on a hill, light to the darkness. Because this is what God has called us to do and His children seek to please Him.
Let me close with a similar passage.
24 Now to him who is able to keep you from stumbling and to present you blameless before the presence of his glory with great joy,
25 to the only God, our Savior, through Jesus Christ our Lord, be glory, majesty, dominion, and authority, before all time and now and forever. Amen. - Jude 1:24-25