The study explores the process of vocations formation as the basis of the priesthood. The article presents the basic stages of development of a vocation to the priesthood. The particular attention should be paid to the emphasis on the formation of candidates for the priesthood in the context of the provisions of synods and councils, as well as the approval of local bishops. It is necessary to highlight the need to provide appropriate formation education for future clergy by combining teaching and education in a seminary. A separate issue is the process of forming the future clergy through upbringing in a family and forming them in the environment of peers.