An article in context by Alejandro Bermudez, translator of On Heaven and Earth.
Cardinal Bergoglio embraced the priests and their ministry. He would visit them in the shanty towns, send them to rest if they were tired and replace them himself at their parish for a few days. He would personally take care of them if they were in bed sick — essentially, he looked after their particular needs.
The only time he removed a villero priest from a shanty town was to protect him from a local drug lord who sent death threats.
And with the same fatherly solicitude that he used to care for his priests, the archbishop requested that they return to wearing clerics; refrain from using “batata” (an Argentinean sweet potato) instead of unleavened bread to celebrate Mass; and use songs from Catholic songbooks rather than political or secular songs. Most often, he used persuasion with his pastors to transform the liturgical abuses in Buenos Aires, but also, in the words of a fellow Jesuit, “he never flinched when tough measures were required.”
More here.