ANSWER: It is worthy of note that the same Greek word is here used as that in Gen. 2:7, to express the inspiration of the new, spiritual life of recreated humanity By "breathing," as Augustine observes, "Jesus shewed that the Spirit was not the Spirit of the Father only, but also his own," and as it is without the Greek article, it is a gift of the Spirit rather than the Person of the Spirit. This gift of spiritual life was necessary to their reception of the Personal Spirit at Pentecost. A dead soul can be inspired with life, but cannot actively receive the Personal Spirit in all his offices, especially that of entire sanctification.
— Steele's Answers pp. 188, 189.