It is necessary in the study of Karma-Yoga to know what duty is. If I have to do something I must first know that it is my duty, and then I can do it. The idea of duty again is different in different nations. The Mohammedan says what is written in his book, the Koran, is his duty; the Hindu says what is in the Vedas is his duty; and the Christian says what is in the Bible is his duty. We find that there are varied ideas of duty, differing according to different states in life, different historical periods and different nations. The term "duty", like every other universal abstract term, is impossible clearly to define; we can only get an idea of it by knowing its practical operations and results.

When certain things occur before us, we have all a natural or trained impulse to act in a certain manner towards them; when this impulse comes, the mind begins to think about the situation. Sometimes it thinks that it is good to act in a particular manner under the given conditions; at other times it thinks that it is wrong to act in the same manner even in the very same circumstances. The ordinary idea of duty everywhere is that every good man follows the dictates of his conscience. But what is it that makes an act a duty? If a Christian finds a piece of beef before him and does not eat it to save his own life, or will not give it to save the life of another man, he is sure to feel that he has not done his duty.

But if a Hindu dares to eat that piece of beef or to give it to another Hindu, he is equally sure to feel that he too has not done his duty; the Hindu's training and education make him feel that way. In the last century there were notorious bands of robbers in India called thugs; they thought it their duty to kill any man they could and take away his money; the larger the number of men they killed, the better they thought they were. Ordinarily if a man goes out into the street and shoots down another man, he is apt to feel sorry for it, thinking that he has done wrong. But if the very same man, as a soldier in his regiment, kills not one but twenty, he is certain to feel glad and think that he has done his duty remarkable well. Therefore we see that it is not the thing done that defines a duty. To give an objective definition of duty is thus entirely impossible. Yet there is duty from the subjective side. Any action that makes us go Godward is a good action, and is our duty; any action that makes us go downward is evil, and is not our duty

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