tapo na kalko'dhyayanaM na kalkaH
svAbhAviko vedavidhir na kalkaH
prasahya vittAharaNaM na kalkaH
stAnyeva bhAvopahatAni kalkaH
Mahabharata, Adi Parva (Book of the Beginning)
Last sloka of the first chapter: Anukramanika Parva

Tapa is innocent, study is harmless, the ordinance of the Vedas prescribed for all the tribes are harmless, the acquisition of wealth by exertion is harmless; But when they are abused in their practices it is then that they become sources of evil.

Translation by Kisari Mohan Ganguli

Mortification is not dregs, Vedic study is not dregs, and the nature-given rules of the Veda are not dregs, the vigorous acquisition of wealth is not dregs - but that is what they become when they are beaten by the beings.

Translation by J. A. B. van Buitenen