Singer and songwriter Paul McCartney, one of the Fab Four and a successful solo performer, wrote this lyric for the 1969 Beatles album "Abbey Road." This sentiment is quintessentially Beatles and true to the ‘60s anti-war movement, which urged, “Make love, not war.” This line closes “The End,” the last song recorded collectively by all four Beatles. In 1994, McCartney said of the lyric, “I can’t think of anything much better as a philosophy, because all you need is love.” As the musicians' time together wound down, McCartney sent a closing message to fans: Love is reciprocal, self-replicating, and self-validating — love created is love received.