But even in law the basis of determining the truth by a majority of texts is the fact of the consensus of the spiritual elect, the _ijma_.[105] This theory Islamic science worked out to its logical conclusions. We seek to find the truth, each for himself, by personal pondering, but the Arabian savant feels for and ascertains the general conviction of his associates, which cannot err because the mind of God and the mind of the community are the same. If _consensus_ is found, truth is established. “_Ijma_” is the key of all Early Christian, Jewish, and Persian Councils, but it is the key, too, of the famous Law of Citations of Valentinian III (426), which the law-men have universally ridiculed without in the least understanding its spiritual foundations. The law limits the number of great jurists whose texts were allowed to be cited to five, and thus set up a canon--in the same sense as the Old and New Testaments, both of which also were summations of texts which might be cited as canonical. If opinions differed, the law of Valentinian laid it down that a majority should prevail, or if the texts were equally divided, the authority of Papinian.[106] The interpolation method, used on a large scale by Tribonian for the Digest of Justinian, is a product of this same outlook. A canonical text is in its very idea true and incapable of improvement. But the actual needs of the spirit alter, and so there grew up a technique of secret modifications which outwardly kept up the fiction of inalterability and which is employed very freely indeed in all religious writings of the Arabian world, the Bible included.