Polish the mirror again and again

They have told us that we must practice it. We must practice keeping on putting, repeatedly keeping God in the center. So when Bhagawan Sri Ramana Maharshi said that the mirror must be polished again and again. Punah punah. The mirror must be polished again and again. So, what is this polishing? And he said that we must remain there, we must abide in that. So, that remaining, that abiding is very important. So, just we'll go on a little deep so that...