Paul’s ministry to the Thessalonians was focused on grounding these Gentile believers in the gospel and giving them the appropriate doctrine to live in a manner that was worthy of God (1 Thessalonians 2:12). Paul told the Thessalonians that the word of God was at work in them (1 Thessalonians 2:13) enabling them to live a life that is pleasing to God. Paul said, “For this is the will of God, your sanctification: that you abstain from sexual immorality; that each one of you know how to control his own body in holiness and honor, not in the passion of lust like the Gentiles who do not know God; that no one transgress and wrong his brother in this matter, because the Lord is an avenger in all these things, as we told you beforehand and solemnly warned you. For God has not called us for impurity, but in holiness. Therefore whoever disregards this, disregards not man but God, who gives his Holy Spirit to you” (1 Thessalonians 4:3-8). Paul differentiated the born again Thessalonians from their Gentile past and indicated that God had not called them for impurity, but in holiness (1 Thessalonians 4:7). The Greek word that is translated holiness, hagiasmos (hag-ee-as-mosˊ) is also translated as sanctification in verse 3 of this passage. Holiness is the resultant state produced by the indwelling of the Holy Spirit. Hagiasmos refers not only to the activity of the Holy Spirit in setting man apart unto salvation and transferring him into the ranks of the redeemed, but also enabling him to be holy even as God is holy (2 Thessalonians 2:13).
The Israelites, who were delivered from slavery in Egypt and given possession of the land that God promised to Abraham (Genesis 15:7), were sanctified or made holy by being set apart to God. The Israelites devotion to God was the basis of this sanctification. When Jeremiah began his ministry, he brought God’s charges against the Israelites. Though they had enjoyed a special relationship with God, the people failed to acknowledge what he had done in the past and had turned instead to idols (note on Jeremiah 2:1-19). Jeremiah 2:1-3 states, “The word of the LORD came to me, saying, ‘Go and proclaim in the hearing of Jerusalem, Thus says the LORD, “I remember the devotion of your youth, your love as a bride, how you followed me in the wilderness, in a land not sown. Israel was holy to the LORD and the firstfruits of his harvest.”’” The Israelites were devoted to God initially, but as time went on, they became more and more corrupt like the people around them and eventually, forsook the LORD altogether. The extreme sinfulness of God’s people is emphasized in Jeremiah 3:1-4:4 as “both Israel and Judah are characterized as unfaithful wives (Jeremiah 3:1-13) and are urged to return to the Lord (Jeremiah 3:14-4:4)” (note on Jeremiah 3:1-4:4). Jeremiah 3:6-10 states:
The Lord said to me in the days of King Josiah: “Have you seen what she did, that faithless one, Israel, how she went up on every high hill and under every green tree, and there played the whore? And I thought, ‘After she has done all this she will return to me,’ but she did not return, and her treacherous sister Judah saw it. She saw that for all the adulteries of that faithless one, Israel, I had sent her away with a decree of divorce. Yet her treacherous sister Judah did not fear, but she too went and played the whore. Because she took her whoredom lightly, she polluted the land, committing adultery with stone and tree. Yet for all this her treacherous sister Judah did not return to me with her whole heart, but in pretense, declares the Lord.”
Israel’s ungodly lifestyle was a result of their unbelief. Paul explained in his letter to the Romans that Israel was broken off because of their unbelief and said, if they do not continue in their unbelief they will be grafted in, “for God has the power to graft them in again” (Romans 11:23). It was also explained in the letter to the Hebrews that the people of Israel had become hardened in their sin (Hebrews 3:13). Hebrews 3:12-19 states, “Take care, brothers, lest there be in any of you an evil, unbelieving heart, leading you to fall away from the living God. But exhort one another every day, as long as it is called ‘today,’ that none of you may be hardened by the deceitfulness of sin. For we have come to share in Christ, if indeed we hold our original confidence firm to the end. As it is said, ‘Today, if you hear his voice, do not harden your hearts as in the rebellion.’ For who were those who heard and yet rebelled? Was it not all those who left Egypt led by Moses?And with whom was he provoked for forty years? Was it not with those who sinned, whose bodies fell in the wilderness? And to whom did he swear that they would not enter his rest, but to those who were disobedient? So we see that they were unable to enter because of unbelief.”
Unbelief leads to an ungodly lifestyle because the unbeliever’s heart is attracted to evil rather than that which is pleasing to God. Paul associated sanctification with abstaining from sexual immorality and knowing how to control your own body in holiness and honor (1 Thessalonians 4:3-4). Paul elaborated on the process of sanctification in his letter to the Colossians and described it in terms of putting off the old self and putting on the new self. Paul said believers are to, “Put to death therefore what is earthly in you: sexual immorality, impurity, passion, evil desire, and covetousness, which is idolatry. On account of these the wrath of God is coming. In these you too once walked, when you were living in them. But now you must put them all away: anger, wrath, malice, slander, and obscene talk from your mouth. Do not lie to one another, seeing that you have put off the old self with its practices and have put on the new self, which is being renewed in knowledge after the image of its creator. Here there is not Greek and Jew, circumcised and uncircumcised, barbarian, Scythian, slave, free; but Christ is all, and in all. Put on then, as God’s chosen ones, holy and beloved, compassionate hearts, kindness, humility, meekness, and patience, bearing with one another and, if one has a complaint against another, forgiving each other; as the Lord has forgiven you, so you also must forgive. And above all these put on love, which binds everything together in perfect harmony. And let the peace of Christ rule in your hearts, to which indeed you were called in one body. And be thankful” (Colossians 3:5-15).
God encouraged the unbelieving Israelites to return to him, stating, “Return, faithless Israel, declares the LORD. I will not look on you in anger, for I am merciful, declares the LORD; I will not be angry forever. Only acknowledge your guilt, that you rebelled against the LORD your God and scattered your favors among foreigners under every green tree, and that you have not obeyed my voice, declares the LORD” (Jeremiah 3:12-13). Josiah, the king of Judah, who was reigning at the time that this message was delivered to Israel, did turn back to the LORD with all his heart, soul, and strength (2 Kings 23:25; Jeremiah 34:15), but God’s judgment against the Israelites had already been set in motion and shortly after Josiah’s death, Jerusalem was captured by Nebuchadnezzar and the people of Judah taken into captivity (2 Kings 24-25). Jeremiah prophesied about this disaster, stating, “Behold, he comes up like clouds; his chariots like the whirlwind; his horses are swifter than eagles—woe to us, for we are ruined! O Jerusalem, wash your heart from evil, that you may be saved. How long shall your wicked thoughts lodge within you? For a voice declares from Dan and proclaims trouble from Mount Ephraim. Warn the nations that he is coming; announce to Jerusalem, ‘Besiegers come from a distant land; they shout against the cities of Judah. Like keepers of a field are they against her all around, because she rebelled against me, declares the LORD. Your ways and your deeds have brought this upon you. This is your doom, and it is bitter; it has reached your very heart’” (Jeremiah 4:13-18).
An ungodly lifestyle originates in the individual’s heart. Jesus explained to his disciples that it was not what they ate that defiled them, “but what comes out of the mouth that defiles a person” (Matthew 15:11). When Peter asked him to explain the meaning of the parable he was using to illustrate his point, Jesus asked, “Are you also still without understanding? Do you not see that whatever goes into the mouth passes into the stomach and is expelled? But what comes out of the mouth proceeds from the heart, and this defiles a person. For out of the heart come evil thoughts, murder, adultery, sexual immorality, theft, false witness, slander. These are what defile a person. But to eat with unwashed hands does not defile anyone” (Matthew 15:16-20).
“The word repent means to ‘turn or to change.’ It is best illustrated by the picture of someone who is walking one way (towards sin) and out of conviction turns 180 degrees in their spiritual heart attitude and heads in the opposite direction of that sinful thought, word, or deed” (Fundamentals, Guilt and Repentance, p. 78). When God encouraged the people of Israel to return to him, he was expecting them to repent or turn from their sin and head in the opposite direction toward him. God said he would not look on them with anger because he is merciful (Jeremiah 3:12). God’s mercy makes it possible for a person to change their ungodly lifestyle into a godly one because it provides a pattern, model, and the strength for the godly person’s life to be directed toward God (H2623). Many of the people that Jesus encountered during his ministry on earth cried out to him for mercy (Matthew 9:27, 15:22, 17:15, 20:30). In his parable of the Pharisee and the tax collector, Jesus illustrated the difference between an ungodly lifestyle and a godly one. Jesus said:
“Two men went up into the temple to pray, one a Pharisee and the other a tax collector. The Pharisee, standing by himself, prayed thus: ‘God, I thank you that I am not like other men, extortioners, unjust, adulterers, or even like this tax collector. I fast twice a week; I give tithes of all that I get.’ But the tax collector, standing far off, would not even lift up his eyes to heaven, but beat his breast, saying, ‘God, be merciful to me, a sinner!’ I tell you, this man went down to his house justified, rather than the other. For everyone who exalts himself will be humbled, but the one who humbles himself will be exalted.” (Luke 18:10-14)
Jesus said the tax collector went down to his house justified. The Greek word that is translated justified, dikaioo (dik-ah-yoˊ-o) is spoken of character and means “to declare to be just as one should be, to pronounce right” and is “spoken especially of the justification bestowed by God on men through Christ, in which he is said to regard and treat them as righteous, i.e. to absolve from the consequences of sin and admit to the enjoyment of the divine favor (Romans 3:26, 30; 4:5; 8:30, 33; Galatians 3:8). The tax collector’s statement, “God, be merciful to me, a sinner!” (Luke 18:13), is what the LORD was referring to when he told the Israelites, “Only acknowledge your guilt” (Jeremiah 3:13), and then promised, “I will give you shepherds after my own heart who will feed you with knowledge and understanding…At that time Jerusalem shall be called the throne of the LORD, and all nations shall gather to it, to the presence of the LORD in Jerusalem, and they shall no more stubbornly follow their own evil heart” (Jeremiah 3:17).