what does the saying “if you want a friend,be one.”mean?

what does the saying “if you want a friend,be one.”mean? if you want a friend,be one怎么翻译? what does the old saying "treat others how you want to be tr What does "a ture friend "mean to you? what does the writer mean by saying be creative?什么意思 what does the sentence hold you head up high mean A Be outgo If you want to be a Friend of the Earth,you must promise the If you want to have a good friend,you should be f___to the p what does friendship mean to you?what makes a good friend? If you shoud get a job in the world?what do you want to be a What does the Olympics mean for you What does the Olmpics mean for you?