How To Know The Self?

Sri Ramana Maharshi

Are there two 'I's? How do you know your own existence? Do you see yourself with these eyes? Question yourself. How does this question arise? Do I remain to ask it or not? Can I find myself as in a mirror? Because your outlook has been outward bent, it has lost sight of the Self and your vision is external. The Self is not found in external objects. Turn your look within and plunge down; you will be the Self. 

Is discovery of the Self dependent on the observance of caste rules? Or should we flout them?

Not in the beginning. Observe them to start with. Caste-rules serve as a check on the vagaries of the mind. It is thus purified.