Irenaeus

For the breath of life, which also rendered man an animated being, is one thing, and the vivifying Spirit another, which also caused him to become spiritual. And for this reason Isaiah said, "Thus saith the Lord, who made heaven and established it, who founded the earth and the things therein, and gave breath to the people upon it, and Spirit to those walking upon it;" thus telling us that breath is indeed given in common to all people upon earth, but that the Spirit is theirs alone who tread down earthly desires. And therefore Isaiah himself, distinguishing the things already mentioned, again exclaims, "For the Spirit shall go forth from Me, and I have made every breath." Thus does he attribute the Spirit as peculiar to God which in the last times He pours forth upon the human race by the adoption of sons; but [he shows] that breath was common throughout the creation, and points it out as something created. Now what has been made is a different thing from him who makes it. The breath, then, is temporal, but the Spirit eternal. The breath, too, increases [in strength] for a short period, and continues for a certain time; after that it takes its departure, leaving its former abode destitute of breath. But when the Spirit pervades the man within and without, inasmuch as it continues there, it never leaves him.