When you spread your wings and fly again, most people will care about how high you fly; and a small number of people will worry about whether you are tired from flying; but only one person will ask you what you think about when you fly and where you want to fly. This is the difference between ordinary people, friendship and love. No matter where you fly, you will be cared for and worried about. And learning this proves that when you grow up and look back, you will find that every step you take has footprints, and nothing will erase them.