'He who knowing this meditates on him, destroys sin, obtains the world (of Agni Gârhapatya), reaches his full age, and lives long; his descendants do not perish. We guard him in this world and in the other; whosoever knowing this meditates on him.'
In plain words: The fire says whoever knows this and meditates on it is freed from wrongdoing, lives a long full life, and his family line continues. The fires protect such a person in this world and the next.