Adam Clarke on Romans 10:20

But Esaias (the Greek orthography for Isaiah) is very bold - Speaks out in the fullest manner and plainest language, Isa 65:1, notwithstanding the danger to which such a declaration exposed him, among a crooked, perverse, and dangerous people: I was found of them that sought me not; I put my salvation in the way of those (the Gentiles) who were not seeking for it, and knew nothing of it: thus, the Gentiles which followed not after righteousness have attained to the law of righteousness, Rom 9:30, and they have found that redemption which the Jews have rejected.