We are constantly comparing ourselves with others. The old adage that "the other man's grass is always greener" atests to this and to how misleading such comparsons can be. Consider then, the following:
"There can be no jealousy or discontent if you do what you know you must do. And if you do it to the best of your ability, you can do no more. If you do neither of these, then you should dissatisfied."