Augustine of Hippo, on 1John 4:1

“Dearly beloved, believe not every spirit, but try the spirits if they be of God: because many false prophets are gone out into the world.”

“The Holy Spirit is spoken of in the Gospel by the name of water; where the Lord "cried and said, If any man thirst, let him come unto me, and drink. He that believeth on me, out of his belly shall flow rivers of living water." But the evangelist has expounded of what He said this: for he goes on to say, "But this spake He of the Spirit, which they that believed on Him should receive." Wherefore did not the Lord baptize many? But what saith he? "For the Holy Ghost was not yet given; because that Jesus was not yet glorified." Then seeing those had baptism, and had not yet received the Holy Ghost, whom on the day of Pentecost the Lord sent from heaven, the glorifying of the Lord was first waited for, so that the Spirit might be given.”

Imported from an open dataset — not yet checked against the printed edition.