I am still reading Mother Teresa's letters. In the days she was forming her missionaries, she frankly was a pain. I feel for her bishop -- he was bombarded by constant letters begging him to grant permission for the Missionaries of Charity. He would tell her to be patient (he needed to get approval from others). Yet she refused to stop. She constantly felt our Lord's presence imploring her to do his will.
If was after she commenced her mission that her dark night began.