Jealousy is listed by the apostle Paul as a work of the flesh (Galatians 5:20); it will keep one from entering into heaven (Galatians 5:21). Webster defines jealousy as "resentfully envious." It is a trait that has its roots in darkness (Romans 13:12-13). When one is filled with jealousy, it keeps them from being rational about other things that are happening around them. A jealous individual is filled with resentment and often times has a negative outlook on life.
There are several things that causes one to become jealous. Some of these things include ignorance (Romans 1:28-29), vainglory (Galatians 5:26), and carnality (1 Corinthians 3:3). But I feel that the number one thing that causes most people to be jealous is selfishness. Paul wrote: "he is proud, knowing nothing, but is obsessed with disputes and arguments over words, from which come envy, strife, reviling, evil suspicions, useless wranglings of men of corrupt minds and destitute of the truth, who suppose that godliness is a means of gain. From such withdraw yourself" (1 Timothy 6:4-5). The self-seeking individual who cares only about himself is usually the one that also becomes engulfed in jealousy.
What are the results of jealousy? "For where envy and self-seeking exist, confusion and every evil thing are there" (James 3:16). Jealousy keeps one from being rational and as a result confusion exists. When one becomes confused they are then more likely to succumb to evil deeds. Solomon wrote: "Wrath is cruel and anger a torrent, but who is able to stand before jealousy?" (Proverbs 27:4). A certain destruction will await all those who are filled with the sin of jealousy.
Therefore, cast this evil away (2 Peter 2:1), and learn to love your fellow man. "Love suffers long and is kind; love does not envy; love does not parade itself, is not puffed up" (1 Corinthians 13:4). Recognize jealousy for what it really is; cast it aside, and live by the fruit of the Spirit (Galatians 5:22-23).