In plain words
The disciple asks: the mahāvākyas of the four Vedas may declare the indweller of this perishing body to be Sat-Cit-Ānanda, and the teacher may say, ‘You are Brahman’; but how does the lived certainty ‘I am stainless Sat-Cit-Ānanda’ become firmly established? O Guru, mighty elephant that breaks down the cities of the five sheaths, show me.