You can listen when they need to talk, be honest when they need the truth, be strong when they need a rock, be there when they are alone, be forgiving when they are hurtful, be humble even when you're right, be the friend for them... Even when they are not one to you. And one day, you'll get tired of it, you'll forget who you are and you'll be the one who talks but never listens, tells them what they want to hear instead of what they need to hear, you'll be too weak to pick anyone else up anymore, you'll be the selfish one that isn't there for anyone, you'll be too bitter to forgive & forget, you'll start to boast when you are right & they are wrong... And I just hope you realize... this doesn't make you a bad person or even a bad friend. It's what makes you human.