Romans 11:30

As you also in times past did not believe God, but now have obtained mercy through their unbelief, which was an occasion of God's sending his preachers to you: but the cause of your salvation is God's mercy. --- That they also may obtain mercy. That is, God has permitted their incredulity, that being a greater object of pity, he may shew greater mercy in converting them by the free gift of his grace. --- For God hath concluded [2] all, that is, has permitted at different times, both Gentiles and Jews, to fall into a state of unbelief, that the salvation of all may be known to come, not from themselves, but as an effect of his mercy and grace. (Witham) --- He hath found all nations, both Jews and Gentiles, in unbelief and sin; not by his causing, but by the abuse of their own free-will; so that their calling and election are purely owing to his mercy. (Challoner)