The physical body acts as a protection

How does the physical body act as a protection?
The physical body acts as a protection by its grossness, by the
very thing we charge against it. It is dull and insensitive, thick,
rigid and hard; it is like a fortress with strong dense walls. The
vital world is fluidic, there things move and mix and interpenetrate
freely; it is like the waves of the sea that ceaselessly flow
into each other and change and mingle. Against this fluidity of
the vital world you are defenceless unless you can oppose to it a
very powerful light and force from inside; otherwise it penetrates
you and there is nothing to hamper its invading influence. But
the body intervenes, cuts you off from the vital world and is a
dam against the flood of its forces.-THE MOTHER.