Each man's secret

A 24 year old guy look at scenery from the train window and shouted:
-Dad, look, the trees that are running behind?
My boys smile. A couple sitting nearby looked at the young man with the pity.
And then he again shouted:
-Dad, look, the clouds in the sky are run by us?
Couple can't take any more and told the man:
-Why don't you take your son to see a doctor that a little better?
The man smiled and said:
-I did. And we also just returned from the hospital. My son is congenital blindness, it recently looking back from today.
Every human being has a story of her own. Don't rush into evaluating other people before you really understand them.