257 To search for spiritual perfection and eternal salvation in the conduct of human affairs and institutions is not to rob these of the power to achieve their immediate, specific ends, but to enhance this power. The words of our divine Master are true for all time: "Seek ye therefore first the kingdom of God and his justice; and all these things shall be added unto you." (56) The man who is "light in the Lord" (57) and who walks as a "child of the light" (58) has a sure grasp of the fundamental demands of justice in all life's difficulties and complexities, obscured though they may be by so much individual, national and racial selfishness. Animated, too, by the charity of Christ, he finds it impossible not to love his fellow men. He makes his own their needs, their sufferings and their joys. There is a sureness of touch in all his activity in every field. It is energetic, generous and considerate. For "charity is patient, is kind; charity envieth not, dealeth not perversely, is not puffed up, is not ambitious, seeketh not her own, is not provoked to anger, thinketh no evil; rejoiceth not in iniquity, but rejoiceth with the truth; beareth all things, believeth all things, hopeth all things, endureth all things." (59)
Source: Mater et Magistra (Vatican.va)