§ 36.4. =The Disciplina Arcani.=--The notion that the sacramental part of the divine service, including in this the prayers and hymns connected therewith, the Lord’s prayer, administration of baptism and the baptismal formula, as well as the anointing and the consecration of the priest, was a _mystery_ (μυστικὴ λατρεία, τελετή) which was to be kept secret from all unbaptised persons (ἀμύητοι) and only to be practised in presence of the baptised (συμμύσται), is quite unknown to Justin Martyr and also to Irenæus. Justin accordingly describes in his Apology, expressly intended for the heathen, in full detail and without hesitation, all the parts of the eucharistic service. It was in Tertullian’s time that this notion originated, and it had its roots in the catechumenate and the consequent partition of the service into two parts, from the second of which the unbaptised were excluded. The official Roman Catholic theology, on the other hand, regards the _disciplina arcani_ as an institution existing from the times of the Apostles, and from it accounts for the want of patristic support to certain specifically Roman Catholic dogmas and forms of worship, in order that they may, in spite of the want of such support, maintain that these had a place in primitive Christianity. § 36.5. =The Doctrine of the Lord’s Supper.=--Though the idea was not sharply and clearly defined, there was yet a widespread and profound conviction that the Lord’s Supper was a supremely holy mystery, spiritual food indispensable to eternal life, that the body and blood of the Lord entered into some mystical connection with the bread and wine, and placed the believing partaker of them in true and essential fellowship with Christ. It was in consequence of the adoption of such modes of expression that the pagan calumnies about _Thyestian feasts_ (§ 22) first gained currency. Ignatius calls the Lord’s Supper a φάρμακον ἀθανασίας, the cup a ποτήριον εἰς ἕνωσιν τοῦ αἵματος Χριστοῦ, and professes εὐχαριστίαν σάρκα εἶναι τοῦ σωτῆρος. Justin Martyr says: σάρκα καὶ αἷμα ἐδιδάχθημεν εἶναι. According to Irenæus, it is not _communis panis, sed eucharistia ex duabus rebus constans, terrena et cœlesti_, and our bodies by means of its use become _jam non corruptibilia, spem resurrectionis habentia_. Tertullian and Cyprian, too, stoutly maintain this doctrine, but incline sometimes to a more symbolical interpretation of it. The spiritualistic Alexandrians, Clement and Origen, consider that the feeding of the soul with the divine word is the purpose of the Lord’s Supper.[100]--Continuation § 58, 2.