See an explanation is like this:
A good friend must meet three conditions. The first one is straight. Be honest, and be more straightforward. In other words, not only the heart does not turn, but also the mouth does not turn. It is not difficult for ordinary people to be upright, and it is even more difficult to be upright. It is difficult to see the shortcomings and mistakes of others and speak them out, especially to be outspoken to friends. The hard part is that it is hard to say because of human feelings; It's because utilitarianism is hard to make up your mind. It is difficult for a person to do such a stupid thing that hurts the other person's face and is not good for himself. However, although the truth is ugly, it is out of true love, so it is a great blessing to get a friend all the time. Secondly, forgive me. Friends can forgive themselves if they make mistakes; It is not difficult to forgive yourself for what you have done to yourself, but it is not easy to really stand in the other person's position and put yourself in the other person's shoes. In particular, he did a universally acknowledged unkind and unjust thing, directly hurting himself without apologizing, and he could forgive himself regardless of the stigma on his back. This is really very difficult! It is almost unreasonable for a person to trust his friends regardless of fame and fortune. But only such friends are true friends. The third is Bo. People who read widely are of course good friends.
Bad friends are the opposite.