Watch children. Watch them live. They cry and get over it. Then they play. Someone makes a face and they laugh. They live life as it should be live - in the actual moment. Oh, to live in the moment, instead of groveling over the past, fretting about the present or speculating on future doom. Oh to live life today, emotions at all.
Maybe that's why Jesus spoke of the wonder of faith as a child in Luke 18:16-17 - "Let the little children come to me, and do not hinder them, for the kingdom of God belongs to such as these. I tell you the truth, anyone who will not receive the kingdom of God like a little child will never enter it."
It's a lesson to all of us who some days find it easier to disengage, to withdraw into the cowl of self-protection when the world hurts us too much. The entire point of this life is to engage in it fully, weep at its maladies and laugh at its hilarities.