Развернуть тему помогут следующие мысли:
1. A true friend is not just the one who can sympathize when you are down, but also and especially the one who can be happy for you, when you are happy.
2. Friends do not give advice, they help you to decide.
3. True friends doesn't crticise, but instead finds positives in a way that you know what and how to improve.
4. There is no such thing as a "true friend". There is just "friend". When any other words are added to the meaning of say "true love" (is there untrue love?), "true friend" (OK friend?) that can mean anything, but not the friend or love.