“To this end we also pray always for you, that our God may count you worthy of your calling klēseōs.”
That is the beginning of Paul’s prayer for the Thessalonians and us. He writes to this end, referring to what he wrote just prior. So, let us consider the context.
Paul, Silvanus, and Timothy, to the assembly of the Thessalonians in God our Father, and the Lord Yeshua the Messiah:
Grace to you and peace from God our Father and the Lord Yeshua the Messiah.
3 We are bound to always give thanks to God for you, brothers, [and sisters] even as it is appropriate, because your faith grows exceedingly, and the love of each and every one of you toward one another abounds, 4 so that we ourselves boast about you in the assemblies of God for your perseverance and faith in all your persecutions and in the afflictions which you endure. 5 This is an obvious sign of the righteous judgment of God, to the end that you may be counted worthy of God’s Kingdom, for which you also suffer. 6 Since it is a righteous thing with God to repay affliction to those who afflict you, 7 and to give relief to you who are afflicted with us, when the Lord Yeshua is revealed from heaven with his mighty angels in flaming fire, 8 punishing those who don’t know God, and to those who don’t obey the Good News of our Lord Yeshua, 9 who will pay the penalty: eternal destruction from the face of the Lord and from the glory of his might, 10 when he comes in that day to be glorified in his holy ones and to be admired among all those who have believed, because our testimony to you was believed.
11 To this end we also pray always for you, that our God may count you worthy of your calling, and fulfill every desire of goodness [good pleasure [eudokian] of goodness [agathōsynēs]] and work of faith with power, 12 that the name of our Lord Yeshua† may be glorified in you, and you in him, according to the grace of our God and the Lord Yeshua the Messiah. 2 Thessalonians 1 WMB
Jesus is our example of being counted worthy.
1 Therefore, holy brothers [and sisters], partakers of a heavenly calling, consider the Emissary and High Priest of our confession: Yeshua, 2 who was faithful to him who appointed him, as also Moses was in all his house. 3 For he has been counted worthy of more glory than Moses, because he who built the house has more honor than the house. 4 For every house is built by someone; but he who built all things is God. 5 Moses indeed was faithful in all his house as a servant, for a testimony of those things which were afterward to be spoken, 6 but Messiah is faithful as a Son over his house. We are his house, if we hold fast our confidence and the glorying of our hope firm to the end. Hebrews 3 See Heb 1:1-4; Heb 2:13-18
1 Therefore let’s also, seeing we are surrounded by so great a cloud of witnesses, lay aside every weight and the sin which so easily entangles us, and let’s run with perseverance the race that is set before us, 2 looking to Yeshua, the author and perfecter of faith, who for the joy that was set before him endured the cross, despising its shame, and has sat down at the right hand of the throne of God. 3 For consider him who has endured such contradiction of sinners against himself, that you don’t grow weary, fainting in your souls. Hebrews 12
In the midst of suffering, the Thessalonians were walking worthy of the calling because…
We are bound to always give thanks to God for you, brothers, [and sisters] even as it is appropriate, because your faith grows exceedingly, and the love of each and every one of you toward one another abounds, 4 so that we ourselves boast about you in the assemblies of God for your perseverance and faith in all your persecutions and in the afflictions which you endure. 2 Thessalonians 1
In the same vein, Paul encouraged the Philippians and us with his instruction unto righteousness [right conduct].
1 Finally, my brothers [and sisters], rejoice in the Lord! To write the same things to you, to me indeed is not tiresome, but for you it is safe. 2 Beware of the dogs; beware of the evil workers; beware of the false circumcision. 3 For we are the circumcision, who worship God in the Spirit, and rejoice in Messiah Yeshua, and have no confidence in the flesh; 4 though I myself might have confidence even in the flesh. If any other man thinks that he has confidence in the flesh, I yet more: 5 circumcised the eighth day, of the stock of Israel, of the tribe of Benjamin, a Hebrew of Hebrews; concerning the law, a Pharisee; 6 concerning zeal, persecuting the assembly; concerning the righteousness which is in the law, found blameless.
7 However, I consider those things that were gain to me as a loss for Messiah. 8 Yes most certainly, and I count all things to be a loss for the excellency of the knowledge of Messiah Yeshua, my Lord, for whom I suffered the loss of all things, and count them nothing but refuse, that I may gain Messiah 9 and be found in him, not having a righteousness of my own, that which is of the law, but that which is through faith in Messiah, the righteousness which is from God by faith, 10 that I may know him, and the power of his resurrection, and the fellowship of his sufferings, becoming conformed to his death, 11 if by any means I may attain to the resurrection from the dead. 12 Not that I have already obtained, or am already made perfect; but I press on, that I may take hold of that for which also I was taken hold of by Messiah Yeshua.
13 Brothers [and sisters], I don’t regard myself as yet having taken hold, but one thing I do: forgetting the things which are behind, and stretching forward to the things which are before, 14 I press on toward the goal for the prize of the high calling of God in Messiah Yeshua. 15 Let us therefore, as many as are perfect, think this way. If in anything you think otherwise, God will also reveal that to you. 16 Nevertheless, to the extent that we have already attained, let’s walk by the same rule. Let’s be of the same mind.
17 Brothers [and sisters], be imitators together of me, and note those who walk this way, even as you have us for an example. 18 For many walk, of whom I told you often, and now tell you even weeping, as the enemies of the cross of Messiah, 19 whose end is destruction, whose god is the belly, and whose glory is in their shame, who think about earthly things. 20 For our citizenship is in heaven, from where we also wait for a Savior, the Lord Yeshua the Messiah, 21 who will change the body of our humiliation to be conformed to the body of his glory, according to the working by which he is able even to subject all things to himself. Philippians 3
All scripture quoted is from the World Messianic Bible Emphasis added