Regarding Radharani's smiling, that is not imagination - so she must smile. Let this be an impetus to your increased service. Radha Krsna topics are for both liberated and conditioned souls, but conditioned souls should not much discuss about the loving affairs between Radha and Krsna because sometimes they misunderstand Radha and Krsna as ordinary boy and girl. So this should be discussed with advanced students, not with ordinary men.
Letter to Himavati, 1 April, 1970