We should avoid jealousy and anger

Verily the most necessary thing is contentment under all circumstances; by this one is preserved from morbid conditions and from lassitude. Yield not to grief and sorrow: they cause the greatest misery. Jealousy consumeth the body and anger doth burn the liver: avoid these two as you would a lion. (Baha’u’llah, The Compilation of Compilations vol. I)