“The Personality of Godhead is described as vastu, or the Substance, and the living entities are described as vastavas, or the innumerable samples of the Substance in relative existence. The relationship of these substantive portions with the Supreme Substance can never be annihilated, for it is an eternal quality inherent in the living being.” (Shrila Prabhupada, Chaitanya Charitamrita, Adi 1.91 Purport)