But there is still the collection of sayings, that "great authority on the matter," from which all the Synoptics, and especially Luke and Matthew, are supposed to have derived the material for their declarations about Jesus. Unfortunately this is to us a completely unknown quantity, as we know neither what this "great" authority treats of, nor the arrangement of the matter in it, nor its text. We can only say that this collection was written in the Aramaic tongue, and the arrangement of its matter was not apparently chronological, but according to the similarity of its contents. Again, it is doubtful whether the collection was a single work, produced by one individual; or whether it had had a history before it came to Luke and Matthew. All the same, "the collection contains such a valuable number of the Lord's words, that in all probability an eye-witness was its author" (!). [394] As for the speeches of Jesus constructed from it, they were never really made as speeches by Jesus, but owe the juxtaposition of their contents entirely to the hand of the compiler. Thus the much admired Sermon on the Mount is constructed by placing together individual phrases of Jesus, which belong to all periods of his life, perhaps made in the course of a year. The ideas running through it and connecting the parts are not those of Jesus, but rather those of the original community; "nevertheless, the historical value of these speeches is, on the whole, very great indeed. Together with the 'Lord's words' of Mark they give us the truest insight into the spirit of the Gospel"(!). [395]