You can safely ignore your friend's invitation, but not of your enemy's.

Your always helping friend may make you weaker. Your always attacking enemy will make your stronger

Your success can and will give birth to undesired entities. False Friends and True enemies.

The worst thing you could to your best friends is to help them in something they could do themselves.

I thank to bad people. They help me identify good people.

Jealousy is your sincerest of sincere friends. It tells you what others have accomplished that you did not.