"Far more indispensable then food for the physical body is spiritual nourishment for the soul. One can do without food for a considerable time, but a man of the spirit cannot exist for a single second without spiritual nourishment."

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...when seeking material light, remember the spiritual light which is indispensable for the soul, and without which it remains in the darkness of the passions, in the darkness of spiritual death. 'I am come as a light into the world,' says the Lord, 'that whosoever believeth on Me, should not abide in darkness' (Jn. 12:46).

— John of Kronstadt