Moreover it is quite impossible to assign the two sets of Lectures to different authors.  In Cat. xviii. § 33 the author promises, as we have seen, that he will fully explain the Sacramental Mysteries in other Lectures to be given in Easter week, in the Holy Sepulchre itself, and describes the subject of each Lecture; to which description the Mystagogic Lectures correspond in all particulars.  Other promises of future explanations are given in Cat. xiii. § 19, and xvi. § 26, and fulfilled in Myst. iv. § 3, and ii. § 6, and iii. § i.  On the other hand the author of Myst. i. § 9, after quoting the words, “I believe in the Father, and in the Son, and in the Holy Ghost, and in one Baptism of repentance,” adds, “Of which things I spoke to thee at length in the former Lectures.”