Question

"Don't admire the flying bird before you know the pain of flapping."

Answer 1

Possibly something similar to "Walk a mile in someone else's moccasins"

"The admonition to walk a mile in someone else's shoes means before judging someone, you must understand his experiences, challenges, thought processes, etc. The full idiom is: Before you judge a man, walk a mile in his shoes. In effect, it is a reminder to practice empathy."