What, therefore, neither the innate understanding nor the law could do, that God performs by the operation of the Holy Spirit through the word or ministry of reconciliation; which is the glad tidings concerning the Messiah, by means whereof it has pleased God to save such as believe, as well under the Old as under the New Testament.
This mystery of His will God revealed to but a small number under the Old Testament; under the New Testament (the distinction between various peoples having been removed) He reveals it to many. The cause of this dispensation is not to be ascribed to the superior worth of one nation above another, nor to their better use of the innate understanding of God, but results wholly from the sovereign good pleasure and unmerited love of God. Hence they to whom so great and so gracious a blessing is communicated, above their desert, or rather notwithstanding their demerits, are bound to acknowledge it with humble and grateful hearts, and with the apostle to adore, but in no wise curiously to pry into, the severity and justice of God's judgments displayed in others to whom this grace is not given.
As many as are called by the gospel are unfeignedly called. For God has most earnestly and truly declared in His Word what is acceptable to Him, namely, that those who are called should come unto Him. He also seriously promises rest of soul and eternal life to all who come to Him and believe.
It is not the fault of the gospel, nor of Christ offered therein, nor of God, who calls men by the gospel and confers upon them various gifts, that those who are called by the ministry of the Word refuse to come and be converted. The fault lies in themselves; some of whom when called, regardless of their danger, reject the Word of life; others, though they receive it, suffer it not to make a lasting impression on their heart; therefore, their joy, arising only from a temporary faith, soon vanishes, and they fall away; while others choke the seed of the Word by perplexing cares and the pleasures of this world, and produce no fruit. This our Savior teaches in the parable of the sower (Matt. 13).
But that others who are called by the gospel obey the call and are converted is not to be ascribed to the proper exercise of free will, whereby one distinguishes himself above others equally furnished with grace sufficient for faith and conversion (as the proud heresy of Pelagius maintains); but it must be wholly ascribed to God, who, as He has chosen His own from eternity in Christ, so He calls them effectually in time, confers upon them faith and repentance, rescues them from the power of darkness, and translates them into the kingdom of His own Son; that they may show forth the praises of Him who has called them out of darkness into His marvelous light, and may glory not in themselves but in the Lord, according to the testimony of the apostles in various places.