|Canto 7: The Science of God||Chapter 12: The Perfect Society: Four Spiritual Classes|
Bhaktivedanta VedaBase: Srimad Bhagavatam 7.12.23
anvikshikyam va vidyayam
yada -- when; akalpah -- unable to act; sva-kriyayam -- in one's own prescribed duties; vyadhibhih -- because of disease; jaraya -- or because of old age; athava -- either; anvikshikyam -- in spiritual advancement; va -- or; vidyayam -- in the advancement of knowledge; kuryat -- one must do; anasana-adikam -- not take sufficient food.
When because of disease or old age one is unable to perform his prescribed duties for advancement in spiritual consciousness or study of the Vedas, he should practice fasting, not taking any food.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupada, Founder Acarya of the International Society for Krishna Consciousness