§1. The duty of fostering vocations rests with the entire Christian community so that the needs of the sacred ministry in the universal Church are provided for sufficiently. This duty especially binds Christian families, educators, and, in a special way, priests, particularly pastors. Diocesan bishops, who most especially are to be concerned for promoting vocations, are to teach the people entrusted to them of the importance of the sacred ministry and of the need for ministers in the Church and are to encourage and support endeavors to foster vocations, especially by means of projects established for that purpose.
§2. Moreover, priests, and especially diocesan bishops, are to have concern that men of a more mature age who consider themselves called to the sacred ministries are prudently assisted in word and deed and duly prepared.
Source: Code of Canon Law (Vatican.va)