Samuel Butler said "Friendship is like money, easier made than kept," according to Wise Old Sayings. "The truth is, everyone is going to hurt you. You just got to find the ones worth suffering for," is a quote from Bob Marley.
Samuel Butler was an English essayist and novelist who died in 1902. His statement elicits sadness because it speaks of the difficulty in keeping friendships. Butler's seemingly bleak childhood, including conflict concerning a future profession, may have contributed to an element of negativism in his world views, as can possibly be gleaned from his comment.
Jamaican reggae legend Bob Marley died in 1981 at the age of 36. Of mixed racial background, he was bullied and derogatorily called "White Boy," relates Biography. While he later credited the bullying with helping him hone his philosophy about race, it may have also aided in making Marley somewhat cynical concerning friendship, especially since it was his own neighbor who teased him.