Adam Clarke on Acts 10:34

God is no respecter of persons - He does God esteem a Jew, because he is a Jew; nor does he detest a Gentile because he is a Gentile. It was a long and deeply rooted opinion among the Jews, that God never would extend his favor to the Gentiles; and that the descendants of Jacob only should enjoy his peculiar favor and benediction. Of this opinion was St. Peter, previously to the heavenly vision mentioned in this chapter. He was now convinced that God was no respecter of persons; that as all must stand before his judgment seat, to be judged according to the deeds done in the body, so no one nation, or people, or individual, could expect to find a more favorable decision than another who was precisely in the same moral state; for the phrase, respect of persons, is used in reference to unjust decisions in a court of justice, where, through favor, or interest, or bribe, a culprit is acquitted, and a righteous or innocent person condemned. See Lev 19:15; Deu 1:16, Deu 1:17; Deu 16:19. And as there is no iniquity (decisions contrary to equity) with God, so he could not shut out the pious prayers, sincere fasting, and benevolent alms-giving of Cornelius; because the very spring whence they proceeded was his own grace and mercy. Therefore he could not receive even a Jew into his favor (in preference to such a person) who had either abused his grace, or made a less godly use of it than this Gentile had done.