A person mature in the faith fully accepts the Gospel invitation by which he is impelled to communion with God and with his brothers; he takes on in his life the duties that are connected with this invitation (cf. AG, 12). Catechesis performs the functions of helping men make this communion with God a reality, and of presenting the Christian message in such a way that it is clear that the highest value of human life is safeguarded by it. All this requires that catechesis keep in mind the legitimate aspirations of men, as also the progress and success of the values contained in these aspirations. Communion with God and adherence to him entail the carrying out of human responsibilities and the duty of solidarity, since all these things are in keeping with the will of God the Savior (cf. GS, 4). Catechesis, therefore, must foster and illumine the increase of theological charity in individual members of the faithful as well as in ecclesial communities, and also the manifestations of that same virtue in connection with the duties that pertain to individuals and to the community.