15. Now how it is that we are in Him through the sacrament of the flesh and blood bestowed upon us, He Himself testifies, saying, And the world will no longer see Me, but ye shall see Me; because I live ye shall live also; because I am in My Father, and ye in Me, and I in you398 Ib. xiv. 19, 20.. If He wished to indicate a mere unity of will, why did He set forth a kind of gradation and sequence in the completion of the unity, unless it were that, since He was in the Father through the nature of Deity, and we on the contrary in Him through His birth in the body, He would have us believe that He is in us through the mystery of the sacraments? and thus there might be taught a perfect unity through a Mediator, whilst, we abiding in Him, He abode in the Father, and as abiding in the Father abode also in us; and so we might arrive at unity with the Father, since in Him Who dwells naturally in the Father by birth, we also dwell naturally, while He Himself abides naturally in us also.
15. Perfecta nobis, Christo mediante, cum Deo unitas.---Quam autem in eo per sacramentum communicatae carnis et sanguinis simus, ipse testatur dicens, Et hic mundus me jam non videt; vos autem me videbitis, quoniam ego vivo, et vos vivetis; quoniam ego in Patre meo, et vos in me, et ego in vobis (Joan. XIV, 19, 0248A etc.). Si voluntatis tantum unitatem intelligi vellet: cur gradum quemdam atque ordinem consummandae unitatis exposuit: nisi ut cum ille in Patre per naturam divinitatis esset; nos contra in eo per corporalem ejus nativitatem, et ille rursum in nobis per sacramentorum inesse mysterium crederetur: ac sic perfecta per Mediatorem unitas doceretur, cum nobis in se manentibus ipse maneret in Patre, et in Patre manens maneret in nobis; et ita ad unitatem Patris proficeremus, cum qui in eo naturaliter secundum nativitatem inest, nos quoque in eo naturaliter inessemus, ipso in nobis naturaliter permanente?