I believe there is a vast difference between an effort for transformation which, precisely, comes from the Psychic Centre of the being and a kind of mental construction to obtain something.
I do not know, it is very difficult to make oneself understood, but so long as the thing goes on in the head in this way (Mother turn a finger near her forehead), it has no power. It has a very little force that is extremely limited. And all the time it belies itself. One thinks that with great difficulty one collects a will, artificial enough, besides, and one tries to catch something, and the very next minute it has all vanished. And one does not even realise it; one asks oneself: "How does it happen to turn out like that?"
I do not know, indeed it seems to me very difficult to do yoga with the head – unless one is gripped.