Worrying about tomorrow is something you do. Thus you avoid knowing yourself.
You assume a separate self as a hoax that you play, while you are the only player.
Thus you temporarily forget yourself, assume a personality and experience the angst of separation and forgetfulness.
Returning to yourself, the self that you have never in fact left, you weave the path of inquiry and devotion.
All of this is your dream. The dream that you dream via infinite body minds. 
Awakening from the dream is a dream awakening without which the illusory game of separation continues.
Thus, from within the dream and from beyond the dream it is said: inquire into ‘What am I truly?’ ‘What is the reality of this impression?’
That which does not come and go exhorts you to realize the eternity of the beyond.