@SreeCharan It can only be explained by realised person... but how can he explain.. here is what BrihadAranyaka Upanishad states:
"Because when there is duality, as it were, then one smells something, one sees something, one hears something, one speaks
something, one thinks something, one knows something. (But) when to the knower of Brahman everything has become the self, then what should one smell and through what, what should one see and through what, what should one hear and through what, what should one speak and through what, what should one think and through what, what should one know…