It is a unity constituted by the bonds of the profession of faith, the sacraments and hierarchical communion.10 The faithful are one because, in the Spirit, they are in communion with the Son and, in him, share in his communion with the Father: “Our fellowship is with the Father and with his Son Jesus Christ” (1 Jn 1:3). For the Catholic Church, then, the communion of Christians is none other than the manifestation in them of the grace by which God makes them sharers in his own communion, which is