47 But when on the one hand We see thousands of the needy, victims of real misery for various reasons beyond their control, and on the other so many round about them who spend huge sums of money on useless things and frivolous amusement, We cannot fail to remark with sorrow not only that justice is poorly observed, but that the precept of charity also is not sufficiently appreciated, is not a vital thing in daily life. We desire therefore, Venerable Brethren, that this divine precept, this precious mark of identification left by Christ to His true disciples, be ever more fully explained by pen and word of mouth; this precept which teaches us to see in those who suffer Christ Himself, and would have us love our brothers as Our Divine Savior has loved us, that is, even at the sacrifice of ourselves, and, if need be, of our very life. Let all then frequently meditate on those words of the final sentence, so consoling yet so terrifying, which the Supreme Judge will pronounce on the day of the Last Judgment: "Come, ye blessed of my Father . . . for I was hungry and you gave me to eat; I was thirsty and you gave me to drink . . . Amen, I say to you, as long as you did it to one of these my least brethren you did it to me." And the reverse: "Depart from me, you cursed, into everlasting fire . . . for I was hungry and you gave me not to eat; I was thirsty and you gave me not to drink . . . Amen, I say to you, as long as you did it not to one of these least. neither did you do it to me."
Source: Divini Redemptoris (Vatican.va)