He joined the religious community of the Oratorians and was ordained a priest at 24. During severe plagues in 1627 and 1631, he volunteered to care for the stricken in his own diocese. Lest he infect his fellow religious, he lived in a huge cask in the middle of a field during the plague.
At age 32, John became a parish missionary. His gifts as preacher and confessor won him great popularity. He preached over 100 parish missions, some lasting from several weeks to several months.
In his concern with the spiritual improvement of the clergy, he realized that the greatest need was for seminaries. He had permission from his general superior, the...