Leithart
Commenting on John 1:12-13, Calvin says “Some think that an indirect reference is here made to the preposterous confidence of the Jews, and I willingly adopt that opinion. They had continually in their mouth the nobleness of their lineage, as if, because they were descended from a holy stock, they were naturally holy. And justly might they have gloried in their descent from Abraham, if they had been lawful sons, and not bastards; but the glowing of faith ascribes nothing whatever to carnal generation, but acknowledges its obligation to the grace of God alone for all that is good. John, therefore, says, that those among the formerly unclean Gentiles who believe in Christ are not born the sons of God from the womb, but are renewed by God, that they may begin to be his sons. The reason why he uses the word blood in the plural number appears to have been, that he might express more fully a long succession of lineage; for this was a part of the boasting among the Jews, that they could trace their descent, by an uninterrupted line, upwards to the patriarchs.”
Note that Calvin not only endorses this reasoning, but also that others were saying the same thing at the time.
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