Once the shochet of Salant came to see R. Israel. He proposed giving up shechitah [slaughter], because the heavy responsibility involved in kosher slaughtering was too onerous for him to bear.

"What do you intend to take up?" R. Israel asked him.

"I shall go into business", the shochet answered, "and open a store."

R. Israel looked at him in surprise. "You are concerned about shechitah which involves only one negative commandment, the prohibition against carrion. How much more so should you worry about shopkeeping, in which many admonitions and prohibitions are involved: 'You shall not rob, you shall not covet, you shall not defraud, you shall not overcharge, you shall not deal falsely, you shall not lie, as well as the positive and negative commandments applying to weights and measures, to keep away from falsehood, etc., etc.'" 

--From The Mussar Movement, Volume 1, Part 2, pages 204 - 205