Nor did the apostles attempt in any systematic way to supply the concrete element that Jesus’ teaching might be thought to lack. In only one instance[4] does the New Testament give us anything that purports to be an apostolic decree, and it gives this only in a matter of fundamental importance. Yet even this brief ruling presents serious critical difficulties to modern investigators, and probably something less than full apostolic authority should be accorded it. In St Paul’s Epistles, indeed, it is laid down as a fundamental principle that individual divergences should be tolerated as far as possible even in the same community,[5] so that the apostle turns from general principles to detailed regulations only in the most extreme instances. Each of his churches was left free to develop under the guidance of the Spirit such customs as it might judge profitable—and was warned not to make even these customs too authoritative. And there is no reason to think that the other apostles differed greatly from St Paul in this regard. That some of them may have drawn up certain specific rules for their own communities is abstractly conceivable, but as to this there is no tradition at all in the sources of the apostolic age and nothing of any value in later writings. As a consequence, Christian congregations in search for material to use for legislative purposes could find very little in the primary authoritative teaching of their religion, and were obliged to look elsewhere. But abundant other sources were not lacking.