259 We most earnestly beg all Our sons the world over, clergy and laity, to be deeply conscious of the dignity, the nobility, which is theirs through being grafted on to Christ as shoots on a vine: "I am the vine; you the branches.'' (61) They are thus called to a share in His own divine life; and since they are united in mind and spirit with the divine Redeemer even when they are engaged in the affairs of the world, their work becomes a continuation of His work, penetrated with redemptive power. "He that abideth in men, and I in him, the same beareth much fruit." (62) Thus is man's work exalted and ennobled—so highly exalted that it leads to his own personal perfection of soul, and helps to extend to others the fruits of Redemption, all over the world. It becomes a means whereby the Christian way of life can leaven this civilization in which we live and work—leaven it with the ferment of the Gospel.
Source: Mater et Magistra (Vatican.va)