Romans 10:17

So then faith cometh by hearing - Preaching the Gospel is the ordinary means of salvation; faith in Christ is the result of hearing the word, the doctrine of God preached. Preaching, God sends; if heard attentively, faith will be produced; and if they believe the report, the arm of the Lord will be revealed in their salvation.

So then faith cometh ... - This I take to be clearly the language of the objector. As if he had said, by the very quotation which you have made from Isaiah, it appears that a report was necessary. He did not condemn people for not believing what they had not heard; but he complains of those who did not believe a message actually delivered to them. Even by this passage, therefore, it seems that a message was necessary, that faith comes by hearing, and hearing by the divine message. It could not be right, therefore, to condemn those who had not obeyed the gospel because they had not heard it; and hence, not right to make salvation dependent on a condition which was, by the arrangement of God, put beyond their power. The very quotation from Isaiah, therefore, goes to confirm the objection in Romans 10:14;15.

By hearing - Our translation has varied the expression here, which is the same in two places in the Greek: "Isaiah said, Who hath believed our report τῇ ἀκοῇ tē akoē? So then, you must admit that faith comes by that report ἐξ ἀκοῆς ex akoēs, and therefore this report or message is necessary." When it is said that faith cometh by hearing, it is not meant that all who hear actually believe, for that is not true; but that faith does not exist unless there is a message, or report, to be heard or believed. It cannot come otherwise than by such a message; in other words, unless there is something made known to be believed. And this shows us at once the importance of the message, and the fact that people are converted by the instrumentality of truth, and of truth only.

And hearing - And the report, or the message (η ̔ἀκοὴ hē akoē), is by the Word of God; that is, the message is sent by the command of God. It is his word, sent by his direction, and therefore if withheld by him, those who did not believe could not be blamed. The argument of the objector is, that God could not justly condemn people for not believing the gospel.

10:17 Faith, indeed, ordinarily cometh by hearing; even by hearing the word of God.