Osho says

Osho says "The transfer between a master and a disciple is exactly like the transfer between a lover and the beloved. The lover initiates, but the beloved becomes the womb. The lover initiates, starts, and the beloved completes it. Then the child is born. The child neither belongs to the father alone nor to the mother alone: it belongs to both. The father started, the mother completed it. Between the master and the disciple something exactly like that is happening. Whatsoever I am saying here, if you just try to understand it from the outside, you will miss. It is not for outsiders, it is only for insiders. Hence my insistence for sannyas. Sannyas is just a gesture that you have become part of my family, that you are married with me, that now we can take the responsibility of a child, that we can father and mother a child -- a new being is possible."