Porphyry is right to suggest that Plotinus' teaching "voice" has about it something particular (idios), speaking as if inspired and from his own experience rather than out of the tradition. The rhetorical character of the "voice" is precisely that of an autobiographical urgency in the attainment of the One: "Attempt to lead the god in you back to the godhead in the all."

Authority and persuasion in philosophy (1985)