One has to thoroughly understand why the World is mere Name and Form (Nama-Rupa), including one’s body and mind including the ego sense or egoic-I, by understanding the analogies of Clay and Pot, Water and Wave, Gold and Ornaments made of gold. Thereafter, if one can draw out all the implications of the World being mere Name and Form, then one can understand all the truths enunciated by Advaita philosophy. Once that is accomplished, one will see that it is very easy to let go the internal mental chatter about the world and oneself. Thus, one becomes mentally still (Summa Iru) and the Truth will dawn that Only Consciousness Exists and I am Consciousness (Aham Brahmasmi).
Know Thyself 
getting the crux, sir
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