Jealousy is the greatest disease – it is lodged from birth in everyone – now as the Talmud teaches, "man is jealous of everyone and everything except for their child or disciple" – in other words, when we love someone, we seek their best – however when someone dissociates- in other words, accepts that "people are bad" (which is based on experience, so, for example, you may love dogs, but if you get bitten constantly, you will begin to fear, hence hate, hence judge)