I think this dialogue was by Jiwan. Jiwan who, you ask. He was a Sakuni-like quintessential villain of yesteryear - back when Amitabh Bachan was an angry young man and Pran, Prem Chopra were still raping/pillaging/smuggling/yadda yadda yadda. "Harami? Main harami nahin hun. Main to kutta hun kutta. Ishi liye to galey me patti badhta hun." Forgot which movie it is from.