Rabbi Ellezer says

Rabbi Ellezer says: A good eye. "A good eye" is the quality of being pleased with another's good fortune. Rabbi Eliezer proposes that this quality cultivates goodness most effectively because there are plentiful opportunities for us to practice it, and it takes no time at all to be happy for others' good fortune. Looking around, we can always find evidence of wealth, social position and other successes. Rabbi Eliezer's colleagues felt that other personality traits offer even better opportunities to cultivate goodness. The difference of opinion as to which trait is best revolves around the balance of quantity and quality. For example, Rabbi Eliezer suggests that a kindly view of people's good fortune is best because the opportunity to make use of this trait is always available. In contrast, Rabbi Yehoshua favors the trait of being a good friend because it exercises a higher level of goodness, albeit with fewer opportunities to practice it.

— from The Air Traffic Controller (God)

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The principle runs all through our law: it is forbidden to take any enjoyment from this world without first pronouncing a blessing over it, because the world was never ours to begin with — "the earth is the Lord's, and the fullness thereof" — so that whatever we give, we are only ever handing Him back from His own. The whole posture our sages prized in a person is caught in two words: a good eye — the eye trained to see what it has been given rather than what it lacks. This is not soft sentiment; it works on a person whether or not he believes in it. — The Air Traffic Controller (God)

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