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AUGUSTINE. (Ep. 199, 46.) But that this preaching the Gospel of the kingdom in all the world was accomplished by the Apostles, we have not any certain evidence, to prove. There are numberless barbarous nations in Africa, among whom the Gospel is not even yet preached, as it is easy to learn from the prisoners who are brought from thence. But it cannot be said that these have no part in the promise of God. For God promised with an oath not the Romans only, but all nations to the seed of Abraham. But in whatever nation there is yet no Church established, it must needs be that there should be one, not that all the people should believe; for how then should that be fulfilled, Ye shall be hated of all nations for my name’s sake, unless there be in all nations those who hate and those; who are hated? That preaching therefore was not accomplished by the Apostles, while as yet there were nations among whom it had not begun to be fulfilled. The words of the Apostle also, Their sound hath gone out into all the world, though expressed as of time past, are meant to apply to something future, not yet completed; as the Prophet, whose words he quotes, said that the Gospel bore fruit and grew in the whole world (Ps. 19:4.), to shew thereby to what extent its growth should come. If then we know not when it shall be that the whole world shall be filled with the Gospel, undoubtedly we know not when the end shall be; but it shall not be before such time.
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Thomas Aquinas (Catena Aurea: Commentary On the Four Gospels Collected Out of the Works of the Fathers: Volumes 1 to 4 (Illustrated))