[436] "Well then, friend Kaccāna, I shall make a simile for you; for by means of a simile some wise persons here understand the meaning of what has been said. Suppose, friend Kaccāna, an oil lamp is burning whose oil is impure and whose wick is impure; because of the impurity of the oil and the impurity of the wick, it burns dimly, as it were. So too, friend Kaccāna, some bhikkhu here dwells having pervaded and resolved upon 'corrupted radiance.' His bodily inertia (kāyaduṭṭhulla) is not well tranquilized, his dullness and drowsiness is not well uprooted, and his restlessness and remorse is not well removed. Because his bodily inertia is not well tranquilized, his dullness and drowsiness not well uprooted, and his restlessness and remorse not well removed, he meditates dimly, as it were. With the breaking up of the body, after death, he is reborn in the companionship of the gods of corrupted radiance.
Suppose, friend Kaccāna, an oil lamp is burning whose oil is pure and whose wick is pure; because of the purity of the oil and the purity of the wick, it does not burn dimly, as it were. So too, friend Kaccāna, some bhikkhu here dwells having pervaded and resolved upon 'pure radiance.' His bodily inertia is well tranquilized, his dullness and drowsiness is well uprooted, and his restlessness and remorse is well removed. Because his bodily inertia is well tranquilized, his dullness and drowsiness well uprooted, and his restlessness and remorse well removed, he does not meditate dimly, as it were. With the breaking up of the body, after death, he is reborn in the companionship of the gods of pure radiance.
This, friend Kaccāna, is the cause, this is the condition why, among those deities reborn into a single order of gods, some deities there are of corrupted radiance and some deities there are of pure radiance."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.