Having said that, the phrases ‘self-enquiry’ and ‘self-investigation’ are legitimate because this process is, in most cases, initiated by a question such as, ‘What is it that knows or is aware of my experience?’, ‘Where do thoughts come from?’, ‘What is the nature of the knowing with which all knowledge and experience are known?’, ‘Am I aware?’ or ‘Who am I?’ As the mind ponders these questions, it becomes progressively refined, travelling back through layers of objective experience, gradually purifying itself of all objective, limiting qualities.