Note 92 — Quest. IX., X., XI.
Reading edition
Some have thought, that εκεινος being of the masculine gender, because it refers immediately to πνευμα, which is of the neuter, implies, that the Spirit is taken personally, which is the reason of this grammatical construction; but if it be said that the reason why it is masculine is, because it agrees with παρακλητος, it, notwithstanding, proves the Personality of the Holy Ghost, since a Comforter is a personal character. The same thing is observed in the grammatical construction of that scripture, Eph. i. 13, 14. speaking concerning the Holy Spirit of promise, το πνευμα της επαγγελιας; it is said, ὁς εστιν αρῥαβων, which denotes the personal character of the Spirit, otherwise it would have been ὁ εστιν αρῥαβων, unless you suppose ὁς agrees with αρῥαβων, which seems to be a more strained sense of the grammatical construction than the other, which proves his personality.