Nearly a century ago, Paul Volz, who is known primarily for his research on early Jewish eschatology, wrote a provocative analysis of the divine spirit in Jewish antiquity; one quarter of this study is devoted to “the spirit hypostasis” (Geisthypostase), that is, spirit (πνεῦμα) interpreted as an independent being rather than a natural element, such as wind, or the spiritual element of humankind, such as the soul.1 In the context of this intriguing discussion, Volz observed that “Philo unequivocally describes the spirit as an hypostasis,” for it mediates God's own power (Mittelwesen), accomplishes concrete actions, such as visiting and leading to truth, and possesses particular characteristics, such as invisibility and complete wisdom. According to Volz, however, Philo understood this spirit hypostasis less as a personal being than a cosmic principle:
The personal character of the Philonic pneuma normally retreats into the background, despite its hypostatic character. The reason for this lies probably in Stoic influence, from which Philo took over the panpsychic pneuma, and moreover in the Philonic conception of the Logos, alongside which the pneuma could never fully be developed.