Many heads of gnostic schools were identified as Jewish Christians by Church Fathers, and Hebrew words and names of God were applied in some gnostic systems. The cosmogonic speculations among Christian Gnostics had partial origins in Maaseh Bereshit and "Maaseh Merkabah". This thesis is most notably put forward by Gershom Scholem (1897–1982) and Gilles Quispel (1916–2006). Scholem detected Jewish "gnosis" in the imagery of the merkavah, which can also be found in "Christian" Gnostic documents, for example the being "caught away" to the third heaven mentioned by Paul the Apostle. Quispel sees Gnosticism as an independent Jewish development, tracing its origins to Alexandrian Jews, to which group Valentinus was also connected.