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What do you think, Assalāyana? Suppose a consecrated khattiya king were to assemble here a hundred men of different birth and say to them: 'Come, sirs, let any here who have been born into a khattiya clan or a brahmin clan or a royal clan take an upper fire-stick of fine quality wood and light a fire and produce heat. And also let any who have been born into an outcast clan, a trapper clan, a wicker workers' clan, a cartwrights' clan, or a scavengers' clan take an upper fire-stick made from a dog's drinking trough, from a pig's trough, from a dust-bin, or from castor-oil wood and light a fire and produce heat.'
"What do you think, Assalāyana? When a fire is lit and heat is produced by someone in the first group, would that fire have a flame, a color, a radiance, and would it be possible to use it for the purposes of fire, while when a fire is lit and heat is produced by someone of the second group, that fire would have no flame, no color, and no radiance, and it would not be possible to use it for the purposes of fire?
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Bhikkhu Bodhi (In the Buddha's Words: An Anthology of Discourses from the Pali Canon (The Teachings of the Buddha))