Ramana Maharshi - Is Self Inquiry the Only Mean for Self Realization

Question : Is enquiry only the means for removal of the false belief of selfhood in the gross body, or is it also the means for removal of the false belief of selfhood in the subtle and causal bodies?
Ramana Maharshi : It is on the gross body that the other bodies subsist. In the false belief of the form “I am the body” are included all the three bodies consisting of the five sheaths. And destruction of the false belief of selfhood in the gross body is itself the destruction of the false belief of selfhood in the other bodies. So inquiry is the means to removal of the false belief of selfhood in all the three bodies.