God himself in his especially personal and self-giving aspect

The Spirit is not some magical, mysteriously supernatural aura of a dynamistic kind, nor a magical being of an animistic kind, but God himself in his especially personal and self-giving aspect: as a power which creates life. The Spirit is God himself, a merciful power establishing his reign over man’s heart, over the whole of man, inwardly present to man and apparent in his workings to man’s human spirit. Hans Kung, The Church