human beings are prone to projecting their internal fears outward in the form of jealousy, obsession, paranoia, anger and any number of other ways.
the enlightened mind recognizes these emotions as a sign of internal struggle and so works to understand and process them.
the unenlightened mind uses them as an excuse to strike out, to blame others, to see enemies where there are none and in so doing, many perpetuate their own misery.