In human society, we are an individual, we need to communicate, need to trust, need help mutually, need on others find their own advantages and disadvantages... So we began to meet people and be friends.
True friends, in you're down, for you will lend a helping hand, will give you encourage and confidence. On your way, will give you the most pertinent opinions, will be sincere blessings.
For friends, I'll be more fancy to friends and moral character, understand him whether I got, the most important is the tacit understanding of and trust, and I believe this is become friends basic principles.