What is the moral of story Postmaster by Rabindranath tagore?

It is a short story by Rabindranath regarding a postmaster. The postmaster was transferred to a village post office of India. Here he met a girl named Ratan with whom he would always continue conversation hours after hours. One day the postmaster fell ill, Ratan has looked after him and in this way a close relationship was developed between them. When the postmaster was transferred to the town again the girl became shocked and she asked him to take her with him but the postmaster was not in a position to take her. Rattan lived with the sheer pain of the lovely memory; she had spent with the postmaster.