In order to attain Nirvana one must be able to understand that his or her self is an illusion , error or is like a dream. This understanding doesn't come naturally. Naturally one finds that there is a self. Naturally one finds that he or she is behind feelings ,thoughts ,perceptions. Most humans and animals (I guess ) would more likely observe and conclude that I am angry, I am coming , I am going , I am doing this or that , I am suffering etc.. He fails to see that he is made up of aggregates. He fails to see that all aggregates dissolve. He fails to see that his self will dissolve too because it is made up of aggregates.He clings to the thought that that was me. Clearly we see that in order to attain Nirvana a sophisticated Teacher is required because Nirvana requires a deep understanding of self. I wonder whether a teacher is always required for Nirvana or nature provides a clue to non-existence of self.
So my questions are :
Is it possible for humans or animals to attain automatic Nirvana? (Here automatic means without any help from external teacher)
If yes , then what is the need of Buddha ?
EDIT : For more clarification on the meaning and nature of the word Automatic in the above question I add the following: I say automatic Nirvana in the above question because all aggregates must dissolve automatically and complete dissolution of Self is Nirvana.No amount of Karma or no kind of karma can keep the Self alive forever.Self by nature is liable to pass away as an error , illusion or dream.
Here I quote,from the book Buddha by Dr. Hermann Oldenberg ,page 216, about the things which no one can stop from happening:
There are five things which no Samana, and no Brahman, and no god, neither Mara, nor Brahma, nor any being in the universe, can bring about. What five things are these ? That what is subject to old age, should not grow old, that what is subject to sickness, should not be sick, that what is subject to death, should not die, that what is subject to decay, should not decay, that what is liable to pass away, should not pass away—this can no Samana bring about, nor any Brahman, nor any god, neither Mara, nor Brahma, nor any being in the Universe."
If no one can stop the dissolution of Self from happening then we see that eventually everyone will attain Nirvana with or without a great teacher like Buddha.