A good and sincere friends. Interested in whether your friends happy? not just that now you have a question, what kind of friends because they are genuinely interested in the inside, not the outside property.
A good friend and true to each other. How happy are you that interested friends. I ask only that you now have it. The sincere friends are interested in each other than in external assets.
Good friend and sincere to each other. He only cares about the friends well? Not only ask that now what do you have? Because sincere friends to each other will be interested in the inside is not a property outside.