"We all know about morality, and we all know about duty, but at the same time we find that in different countries the significance of morality varies greatly. What is regarded as moral in one country may in another be considered perfectly immoral...So it is with duty...In one country, if a man does not do certain things, people will say he has acted wrongly; while if he does those very things in another country, people will say that he did not act rightly - and yet we know that there must be some universal idea of duty... Two ways are left open to us - the way of the ignorant, who think that there is only one way to truth and that all the rest are wrong, and the way of the wise, who admit that, according to our mental constitution or the different planes of existence in which we are, duty and morality may vary. The important thing is to know that there are gradations of duty and of morality - that the duty of one state of life, in one set of circumstances, will not and cannot be that of another."

- Swami Vivekananda, "Each Is Great in His Own Place" (Advanced karma yoga class, Dec 13, 1895, New York Vedanta Society), Karma Yoga, Complete Works: Vol 1