There is no doubt that the practice of meditation leads to a sensitizing of the meditator's mind, if only because he has to make himself passive and receptive during the meditative period. After the first great battle of achieving concentration has been won there is then a possibility that the thoughts, feelings, and moods of other persons may enter his own consciousness if they are either present physically or connected with him mentally. If those impressions are of a lower character than his own character they may either disturb him and give him some trouble in dealing with them, or at the least divert him from his habitual attitude, however briefly, or he may make the mistake of identifying them as being his own, of his own creation. For these reasons it is better for those who are still under development not to attempt by mental treatment to elevate the minds of others directly, unless it is done at the peak period of a meditation, when they have been able to reach a high level of purpose, concentration, and purity. The method of trying to improve others by telepathy is only safely used by adepts, who are firmly established in the higher spiritual position.
-- Notebooks Category 23: Advanced Contemplation > Chapter 6: Advanced Meditation > # 66