[Vipassana Newsletter, Vol. 23, No. 2, 25 February, 2013]
The Buddha described who truly is an outcaste.
"The man who is hot tempered, jealous and hostile, is a sinner, holds wrong view, is a fraud, is cruel, is a tormentor, is a thief, is licentious; one who doesn’t take care of his old parents, troubles others, deceives brahmans, monks or other beggars; utters words that cause harm; hides his immoral acts; praises himself and derides others; who is angry, is a glutton, who is full of ill-desires; is a miser, is wicked; is neither ashamed nor afraid of wrong doings; who calls himself fully liberated without being so; such a man is an outcaste and despicable. One is neither an outcaste by birth nor a brahman by birth. Actions make one an outcaste and another a brahman. A brahman doing unwholesome actions is a cāṇḍāla.”
The Buddha said, "I do not call one a brahman, because he is born to a brahman mother. I call him a brahman, one who possesses nothing and who takes nothing. Not by matted hair, nor by clan or family (caste) nor by birth does one become a brahman, but one who is truthful and righteous, pure and dhammic is a brahman."
The Buddha always put a premium on one's knowledge and conduct, not on his caste.
Come meditators! Let us also be inspired by the pure teachings of the Blessed One, improve our conduct, perform wholesome actions and become brahmans in the true sense of the term!
Kalyāṇmitra, S. N. Goenka
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Words of Dhamma
Tapena brahmacariyena, saṃyamena damena ca; Etena brāhmaṇo hoti, etaṃ brāhmaṇamuttamaṃ'ti.
By austerity, by the holy life, by self-restraint and self- taming one becomes a brahman. This is the supreme state of a brahman.
(Suttanipāta 660, Vāseṭṭha Suttaṃ)