St. Vincent de Paul, when he held missions conducted by his priests, made efforts to create the lay apostolate of the (female) Servants of the Poor and of the (male) Helpers of the Poor for the services of the poor and sick in all his parishes. His manifold occupations made it impossible for the saint personally to supervise and direct these numerous charitable groups.
St. Vincent found in the person of Louise de Marillac his best instrument for the direction of the women.