He writes to his sister Marcellina describing the troubles of the Arians in the years 385 and 386, when the soldiers were sent to break up the service in his church: The next day (it was a Sunday ) after the lessons and the tract, having dismissed the catechumens, I explained the creed [ symbolum tradebam ] to some of the competents [people about to be baptized ] in the baptistry of the basilica.