What does it mean?
If you want good friends, start by being a good friend yourself: kind, loyal and there for people.
Who said it?
Ralph Waldo Emerson: American essayist and poet (1803–1882). Source: "Friendship", Essays (1841).
Friendship– Ralph Waldo Emerson, "Friendship", Essays (1841)
“The only way to have a friend is to be one.”