(31) From these expressions and differences of opinion among the Apostles, and also from the fact that Scripture nowhere testifies of them, as of the ancient prophets, that they went by the command of God, one might conclude that they preached as well as wrote in their capacity of teachers, and not as prophets: but the question is easily solved if we observe the difference between the mission of an Apostle and that of an Old Testament prophet. (32) The latter were not called to preach and prophesy to all nations, but to certain specified ones, and therefore an express and peculiar mandate was required for each of them; the Apostles, on the other hand, were called to preach to all men absolutely, and to turn all men to religion. (33) Therefore, whithersoever they went, they were fulfilling Christ's commandment; there was no need to reveal to them beforehand what they should preach, for they were the disciples of Christ to whom their Master Himself said (Matt. X:19, 20): "But, when they deliver you up, take no thought how or what ye shall speak, for it shall be given you in that same hour what ye shall speak." (34) We therefore conclude that the Apostles were only indebted to special revelation in what they orally preached and confirmed by signs (see the beginning of Chap. 11.); that which they taught in speaking or writing without any confirmatory signs and wonders they taught from their natural knowledge. (See I Cor. xiv:6.) (35) We need not be deterred by the fact that all the Epistles begin by citing the imprimatur of the Apostleship, for the Apostles, as I will shortly show, were granted, not only the faculty of prophecy, but also the authority to teach. (36) We may therefore admit that they wrote their Epistles as Apostles, and for this cause every one of them began by citing the Apostolic imprimatur, possibly with a view to the attention of the reader by asserting that they were the persons who had made such mark among the faithful by their preaching, and had shown by many marvelous works that they were teaching true religion and the way of salvation. (37) I observe that what is said in the Epistles with regard to the Apostolic vocation and the Holy Spirit of God which inspired them, has reference to their former preaching, except in those passages where the expressions of the Spirit of God and the Holy Spirit are used to signify a mind pure, upright, and devoted to God. (38) For instance, in 1 Cor. vii:40, Paul says: But she is happier if she so abide, after my judgment, and I think also that I have the Spirit of God." (39) By the Spirit of God the Apostle here refers to his mind, as we may see from the context: his meaning is as follows: "I account blessed a widow who does not wish to marry a second husband; such is my opinion, for I have settled to live unmarried, and I think that I am blessed." (40) There are other similar passages which I need not now quote.