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I usually don't care much for sappy quotes, but I always need to be reminded of this. Coveting is ugly, and, if left unattended, grows into jealousy. And jealousy can grossly interfere with God's plan for your life, but, even worse, it can interfere with His plan for someone else's life.
My philosophy -since the selfishness people are capable of can be overwhelming stick to this and you'll never be at their level...