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Just to remind you, we're looking at 1 Corinthians 13:4-8 and studying what real, Christ-like love does and doesn't do. This week we're looking at jealousy. I'm using Albert Barnes Notes on the Bible. It's quite lengthy so I've taken the liberty to shorten it as much as possible.
This word properly means to be “zealous” for or against any person or thing; that is, to be eager for, or anxious for or against anyone. It is used often in a good sense (1Co_12:31 , 2Co_11:2); but it may be used in a bad sense - to be zealous “against” a person; to be jealous of; to envy. Act_7:9; Act_17:5; Jam_4:2, It is in this sense, evidently, that it is used here, - as denoting zeal, or ardent desire “against” any person. The sense is, love does not envy others the happiness which they enjoy; it delights in their welfare. As their happiness is increased by their rank, reputation, wealth, health, domestic comforts, and their learning, etc., those who are influenced by love “rejoice” in all this. They would not diminish it; or detract from that happiness. They would not embarrass them in the possession, or complain that they themselves are not so highly favored. To envy is to feel uneasiness, mortification, or discontent at the sight of superior happiness, excellence, prosperity, or reputation enjoyed by another.
The correction of all these things is “love.” If we loved others; if we rejoiced in their happiness, we should not envy them. We should not be unhappy, or seek to injure them, because God has blessed them, or because they have been more industrious, virtuous, and successful than we have. (Albert Barnes Notes on the Bible)
There is no room in the Christian life for envy or jealousy. It was jealousy that started sin in the first place when Satan became jealous of God. “Wherever there is jealousy and rivalry, there is disorder and every kind of evil.” James 3:16
God loves us and in His eyes, each one of us is important to Him. If we keep our focus on God, we won't be able to examine the blessings of others and become envious of them.