Encouraged during his youth to become a priest so he could work with young boys, John was ordained in 1841. His service to young people started when he met a poor orphan and instructed him in preparation for receiving Holy Communion. He then gathered young apprentices and taught them catechism.
After serving as chaplain in a hospice for working girls, John opened the Oratory of St. Francis de Sales for boys. Several wealthy and powerful patrons contributed money, enabling him to provide two workshops for the boys, shoemaking and tailoring.
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