39 It is the same Apostle who portrays for us mankind in the unity of its relations with the Son of God, image of the invisible God, in Whom all things have been created: "In Him were all things created" ( Colossians i. 16); in the unity of its ransom, effected for all by Christ, Who, through His Holy and most bitter passion, restored the original friendship with God which had been broken, making Himself the Mediator between God and men: "For there is one God, and one Mediator of God and men, the man Christ Jesus" (I Timothy ii. 5).
Source: Summi Pontificatus (Vatican.va)