Sikhism is against jealousy. The Sikh Gurus asks the devotees to tackle this negative feeling and overcome it - "Jealousy and envy bring terrible pain, and one is cursed throughout the three worlds.(1)" (sggs page 1091). If one fails to subdue this evil trait, the person will suffer horrible pain everywhere he goes. As a negative emotion it causes harm to the mind and body. When one is jealous, one feels depressed, miserable; it brings hatred to the heart; ill feeling; nastiness and anger are elevated in the mind.