Didymus the Blind : One who takes on discipline and virtue receives in his own character the seal and form of the knowledge that he puts on. So one who is made a partaker of the Holy Spirit becomes likewise spiritual and holy through disciplined fellowship with him. — ON THE HOLY SPIRIT 20 Jerome : It is no small praise for the Ephesians that they have heard not preaching as such but "the word of truth." Remember that we read in another letter that there is a great distance between preaching and the word of truth. — Commentary on Ephesians 1:13 John Chrysostom : "In whom having also believed, ye were sealed with the Holy Spirit of promise, which is an earnest of our inheritance." Here again, the word "sealed," is an indication of especial forecast. He does not speak of our being predestinated only, nor of our being allotted, but further, of our being sealed. For just as though one were to make those who should fall to his lot manifest, so also did God separate them for believing, and sealed them for the allotment of the things to come. You see how, in process of time, He makes them objects of wonder. So long as they were in His foreknowledge, they were manifest to no one, but when they were sealed, they became manifest, though not in the same way as we are; for they will be manifest except a few. The Israelites also were sealed, but that was by circumcision, like the brutes and reasonless creatures. We too are sealed, but it is as sons, "with the Spirit." But what is meant by, "with the Spirit of promise?" Doubtless it means that we have received that Spirit according to promise. For there are two promises, the one by the prophets, the other from the Son. By the Prophets.-Hearken to the words of Joel; "I will pour out My spirit upon all flesh, and your sons and your daughters shall prophesy, your old men shall dream dreams, your young men shall see visions," (Joel ii: 28.) And hearken again to the words of Christ; "But ye shall receive power, when the Holy Ghost is come upon you, and ye shall be my witnesses both in Jerusalem, and in all Judea, and Samaria, and unto the uttermost part of the earth." (Acts. i: 8.) And truly, the Apostle means, He ought, as God, to have been believed; however, he does not ground his affirmation upon this, but examines it like a case where man is concerned, speaking much as he does in the Epistle to the Hebrews; (Heb. vi: 18.) where he says, "That by two immutable things in which it was impossible for God to lie, we may have a strong encouragement." Thus here also he makes the things already bestowed a sure token of the promise of those which are yet to come. For this reason he further calls it an "earnest," (Cf. also 2 Co. i: 22.) for an earnest is a part of the whole. He hath purchased what we are most concerned in, our salvation; and hath given us an earnest in the mean while. Why then did He not give the whole at once? Because neither have we, on our part, done the whole of our work. We have believed. This is a beginning; and He too on His part hath given an earnest. When we show our faith by our works, then He will add the rest. Nay, more, He hath given yet another pledge, His own blood, and hath promised another still. In the same way as in case of war between nation and nation they give hostages: just so hath God also given His Son as a pledge of peace and solemn treaties, and, further, the Holy Spirit also which is from Him. For they, that are indeed partakers of the Spirit, know that He is the earnest of our inheritance. Such an one was Paul, who already had here a foretaste of the blessings there. And this is why he was so eager, and yearned to be released from things below, and groaned within himself. He transferred his whole mind thither, and saw every thing with different eyes. Thou hast no part in the reality, and therefore failest to understand the description. Were we all partakers of the Spirit, as we ought to be partakers, then should we behold Heaven, and the order of things that is there. — Homily on Ephesians 2 Shepherd of Hermas : And the others also he sent into the tower, those, namely, who had returned branches that were green and had offshoots but no fruit, having given them seals. And all who went into the tower had the same clothing-white as snow. — Shepherd of Hermas, Similitude 8 Tertullian : Hence the apostle refers the statement to himself, that is, to the Jews, in order that he may draw a distinction with respect to the Gentiles, (when he goes on to say: ) "In whom ye also trusted, after that ye heard the word of truth, the gospel (of your salvation); in whom ye believed, and were sealed with His Holy Spirit of promise." Of what promise? That which was made through Joel: "In the last days will I pour out of my Spirit upon all flesh," that is, on all nations. — Against Marcion Book V