Around 1613 the De Gondis hired Vincent as the tutor for their son Pierre. Vincent had full responsibility for his intellectual, moral, and religious formation. He was also in charge of the household staff and gave them religious instruction. In addition, he taught catechism and evangelized the peasant farmers on the De Gondi estates. At the same time, he became spiritual director of Madame De Gondi. In a sermon, given probably in this period, he spoke of the “infinite usefulness” of the catechism in forming others.