Not the things of God but God Himself saves — by His Spirit through the ministry of the gospel of Jesus Christ.

“For God has done what the law, weakened by the flesh, could not do. By sending his own Son in the likeness of sinful flesh and for sin, he condemned sin in the flesh, in order that the righteous requirement of the law might be fulfilled in us, who walk not according to the flesh but according to the Spirit.” – Romans 8:3-4

“He saved us, not because of works done by us in righteousness, but according to his own mercy, by the washing of regeneration and renewal of the Holy Spirit, whom he poured out on us richly through Jesus Christ our Savior, so that being justified by his grace we might become heirs according to the hope of eternal life.” – Titus 3:5-7

“What, therefore, neither the light of nature nor the law can do, God performs by the power of the Holy Spirit through the word or ministry of reconciliation, which is the gospel of the Messiah, by which it has pleased God to save men who believe, both under the old and under the new dispensation.” – Canons of Dort