Chapter 20Interactions with Others and the Practice of Yoga · Sympathy for Others
Book 6. Part Two: Sadhana on the Level of the Vital · Section Four: Human Relations in Yoga
By the sympathy you get into contact and receive what is in the other — or also you may give or let go or have drawn from you part of your force which goes to the other. It is the vital sympathy which has this effect; a calm spiritual or psychic goodwill does not bring these reactions.
* Yes, it is dangerous [to sympathise with someone who has gone wrong], because it puts one in touch with the adverse Force that upset him and that Force at once tries to touch you and make its suggestions and contaminate by a sort of contagion or infection.