 His mother's relations - despite being devout - feared that Celli would not follow in his father's footsteps to become a doctor of law but rather that he would consider the religious life.In 1240 he was admitted into the Order of Saint Augustine and his mother became a third order religious.He travelled to the convent on a mule for admission to commence his period of novitiate and in 1242 he had become a well-noted and regarded figure in the convent for his penances and strict adherence to the rule of Saint Augustine.