The descension and development of the Pneuma (Spirit) in relation to the Bodhisattva.  The process of crucifixion within any Initiate upon the Mount of the Skull; the work of the dissolution of the ego in the Second Mountain.  Lecture relates to the Sephirah Chesed, the Inner Spirit. Lecture quote:

"The path of the cross is the path of the bodhisattva. This is why we stated that we are not the first ones to teach this, just as Jesus was not the first one who took the cross and was crucified on the mount of the skulls. There were many initiates who did it before, because this is an alchemical process in which you have to work with the spirit of God."