I cannot predict your every thought and action for the simple reason that most of my own thoughts and actions are completely spontaneous.
I cannot predict what I will do in most instances. I cannot know myself, so I cannot know you. True enough? We are both in the dark, it seems.
That sounds a bit bleak.
Is there any good news?
Yes: A person is not a vacuum. Human thought and action is shared. Shared, copied, modified, suppressed, distilled – we live in each other’s facial expressions.
Simon van Rysewyk 
Love this! Very True!
Many thanks!