In Ennead II 9,9,39–42 we find a singular passage in which Plotinus asserts that the cosmos ‘proclaims’ (προφητεύει) the divine order. It is the only passage in the Enneads where the verb προφητεύειν is used. In this paper the ‘prophetic function’ of the cosmos will be examined. It will be demonstrated how the mentioned passage – despite its unique character in the Enneads – points to the centre of Plotinus’ thought, namely his theory of the causality of intelligible beings. As (...) a sensual product of transcendent causes, the cosmos ‘proclaims’ these causes. In consideration of other relevant passages, the implications of this notion will be delineated to deliver a more comprehensive interpretation of the cosmic προφητεύειν, not least in the context of Plotinus’ remarks about the genesis of time and the fundaments of astrology. It will be shown how Plotinus can articulate his theory of manifestation in terms of a ‘sigetic prophecy’ – ‘sigetic’ in the sense that manifestation unfolds ‘silently’. (shrink)