ISB ~ 1 Timothy 2 v5

one God:The monotheistic faith of Israel (Deut 6:4), which remains a standing truth of the gospel (Jn 17:3; 1 Cor 8:6) (CCC 200-202).

one mediator:A middleman or negotiator who makes friends of enemies. Jesus Christ is the mediator who reconciles the world to the Father in the bonds of the New Covenant (2 Cor 5:18; Heb 9:15). The distance once separating man from God is now bridged by the Incarnation, in which divinity and humanity are forever united in God the Son. In this sense, the mediation of Christ is absolutely unique. Still, the mediation of angels and saints is not ruled out, since union with Christ enables others to share in the saving work of Christ in subordinate and participatory ways. Paul assumes as much in the immediate context, for he urges Timothy and company to pray for civil authorities, i.e., to intercede as mediators between God and their governors in the course of the liturgy (1 Tim 2:1-3) (CCC 618, 970, 1349, 2636).

• A mediator brings together those who are separated, for extremes are united at a midpoint. Uniting men with God is the office of Christ, through whom men are reconciled to God. However, nothing forbids others from being called mediators inasmuch as they cooperate in uniting men with God by directing their way or by ministerial actions (St. Thomas Aquinas, Summa Theologiae III, 26, 1).