This essay deals with the person of the Holy Spirit. Tracing and interpreting the pneumatology of the French theologian François-Xavier Durrwell (1912-2005), this article shows that the author interprets the Spirit as the breath of the Father and the Son, rather than the one spirated by the Father and the Son. In him, the Father begets the Son. The Spirit is not an effect of divine activity; he is the divine activity. Understanding the Spirit as an act, which is based on biblical texts, implies an answer concerning the question of his origin. If the Spirit is the incessant movement, then proceeds from the Father he also proceeds from the Son. In an effort at terminological precision the author formulates the thesis that God the Father gives the Spirit (as his only Originator) and God’s Son shares this Spirit. In the immanent Trinity the Son shares the Spirit with the Father, in the economy he also shares him with human beings who believe in the Son.