spiritual master
Inasmuch as he is the guide of the personal way of the disciple, always within the general way laid down by the Divine authority through tradition, the spiritual master becomes in a certain sense a continuation of the ego of the disciple. Every spiritual alchemy   involves an anticipated death and consequently also certain losses of equilibrium, or periods of obscuration, in which the disciple is not fully master of himself; he is no longer completely of this world, nor yet of the other, and his experience seems to call in question all the existential categories of which we are so to speak woven. In these ’trials’ and in the ’temptations’ which accompany them, (...) the spiritual master plays the role of ’motionless center’. [LogicT, p.220]