To not see this is to miss life itself.
But 'This' includes missing 'This'.
Reflections of the One Life
It carries you and your load whether the load is on your head or on the floor of the train.
You are not lessening the burden of the train by keeping it on your head
but only straining yourself unnecessarily.
Similar is the sense of doership in the world by individuals.
see this page for a great photo that goes along with the writing!