1Co 1:30 But by His doing you are in Christ Jesus, who became to us wisdom from God, and righteousness and sanctification, and redemption,
1Co 1:31 so that, just as it is written, "LET HIM WHO BOASTS, BOAST IN THE LORD."
2Co 1:20 For all the promises of God find their Yes in him. That is why it is through him that we utter our Amen to God for his glory.
2Co 1:21 And it is God who establishes us with you in Christ, and has anointed us,
2Co 1:22 and who has also put his seal on us and given us his Spirit in our hearts as a guarantee.
Jude 1:1 Jude, a slave of Jesus Christ and brother of James, to those who are called, loved in God the Father and kept for Jesus Christ.
1Pe 1:3 Blessed be the God and Father of our Lord Jesus Christ, which according to his abundant mercy hath begotten us again unto a lively hope by the resurrection of Jesus Christ from the dead,
1Pe 1:4 To an inheritance incorruptible, and undefiled, and that fadeth not away, reserved in heaven for you,
1Pe 1:5 Who are kept by the power of God through faith unto salvation ready to be revealed in the last time.
It is by God's doing that we are in Christ, and it is God who establishes us in Christ.
It is God who and His power that keeps us through faith in Christ.
So, there is nothing, zero, zilch, were we can boast except in the Lord.