From Self-Development and the Way to Power, by L. W. Rogers (12)

The first thing necessary is to get a clear understanding of the fact
that the physical body is not the self but only a vehicle or
instrument through which the self is being manifested in the visible
world. The body is as much your instrument as the hand is, or as your
pen is. It is a thing which you, the self, use and a clear conception
of this fact--a feeling that this is the fact--is the first step
toward that absolute control of the physical body that lays the
foundation for success in conscious evolution. When we feel that in
managing the physical body we are controlling something that is not
ourself we are fairly started on the right road.