Students of law, medicine, science, technology, engineering, teacher‑training, and all the other important schools came seeking from Rendu information and recommendations. Or, before performing a good work, they asked her at which door they should knock. Rendu became the center of a charitable movement that characterized Paris and France in the first half of the 19th century. Her experience was priceless for these young people. She directed their apostolate, guided their coming and going in the suburbs, and gave them addresses of families in need, choosing them with care. Afterwards, she facilitated discussion and apostolic reflection on their experiences among persons who were poor.