"If you really belong to the work entrusted to you, then you must do it with your whole heart. What you are doing, I cannot do, and what I am doing, you cannot do. Only sometimes we forget and we spend more time looking at somebody else and wishing we were doing something else."
"Then I observed that most people are motivated to succeed because they envy their neighbors. But this, too, is meaningless--like chasing the wind...To enjoy your work and accept your lot in life--this is indeed a gift from God. God keeps such people so busy enjoying life that they take no time to brood over the past."
Ecclesiastes 4:4, 5:19-20