From The Universal Laws of Spiritual Development as listed in the 1975 Inner Light Consciousness Manual:
ALL BODIES REQUIRE FOOD AND EXERCISE.
SPIRITUAL FOOD AND EXERCISE ARE JUST AS NECESSARY FOR THE HEALTH OF THE SPIRITUAL BODY AS PHYSICAL FOOD AND EXERCISE ARE FOR THE PHSICAL BODY.
SPIRITUAL FOOD CONSISTS OF MEDITATION, PRAYER AND DEVOTION.
SPIRITUAL EXERCISE INCLUDES SERVICE TO OTHERS AND RESISTING TEMPTATION BY MEETING THE DAILY CHALLENGES THE DIVINE WILL PLACES ON OUR PATH.
Spiritual food also consists of reading spiritual journals such as the Bible and other holy texts from the major religions of the world.