First, Let me ask you who is your closest person to you? It can be your wife, husband, son, daughter, mother, father, a friend and so on. Answer this question by keep a name on your mind.
Second, think of everything you know about him/her. Make it on percentage, what is the result? 80%, 90%, alright, thanks for your participation. Here comes the third part
Having a lesson of human assumption, a teacher of mine taught us how much a man suppose to know about another human. If we make it into percent