Gautama spoke and taught about the world, he had to divide it into samsara and Nirvana, into illusion and truth, into sorrow and salvation. There is no other choice, there is no other way for the man who wishes to teach. But the world itself, the Being around us and within us, is never one-sided. Never is a man or a deed all samsara or all Nirvana, never is a man all saintly or all sinful.