Bg 18.42

samo damas tapah saucam
ksantir arjavam eva ca
jnanam vijnanam astikyam
brahma-karma svabhava-jam

Word for word: 
samah — peacefulness; damah — self-control; tapah — austerity; saucam — purity; ksantih — tolerance; arjavam — honesty; eva — certainly; ca — and; jnanam — knowledge; vijnanam — wisdom; astikyam — religiousness; brahma — of a brahmana; karma — duty; svabhava-jam — born of his own nature.

Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Peacefulness, self-control, austerity, purity, tolerance, honesty, knowledge, wisdom and religiousness – these are the natural qualities by which the brahmanas work.