The disciple who wishes to make real progress must attack, weaken, and ultimately destroy certain bad traits of character. Among them is the trait of jealousy of his fellow disciples. It is not only an unpleasant thought but may also end in disastrous consequences. It often leads to wrathful moods and raging spells. It not only harms the other disciple but always does harm to the sinner himself. It is caused by an unreasonable sense of possessiveness directed towards the teacher which does not understand that love should give freedom to him, not deny it to him.
-- Notebooks Category 6: Emotions and Ethics > Chapter 1: Uplift Character > # 51
-- Perspectives > Chapter 6: Emotions and Ethics > # 33