‘Do thy duty without any attachment' at once raises the question, what is duty? We all understand duty generally, but when important issues arise, one is baffled or unclear about one's duty. Man mistaking his desire to be his duty is common. Taking his own opinion or conviction to be DUTY is more usual. For one who thinks and analyses, duty varies. It is often social duty, sometimes duty to conscience, which is psychological duty. What is DUTY, in the absolute sense? To all righteous men of accomplishment, this question constantly presents itself.