When, in order to concentrate exclusively on God, we cut ourselves
off from nature, we destroy our own roots. There must be in us a circuit
between heaven and earth, not a one-way flow, draining us of all vitality.
It is not enough that we draw up the Kundalini from the base of the
spine; we must also draw down the divine light through the
Thousand-Petalled Lotus. Equally, it is not enough for our mental health
and spiritual development that we draw down the Divine Light, we must
also draw up the earth forces. Only too often mental health is sacrificed
to spiritual development through ignorance of, or denial of, this fact.
Nature is God made manifest, and we blaspheme Her at our peril.

Dion Fortune. (1987). Applied Magic. p. 35 (via veneficadreams)