Through the solar plexus and the cerebrospinal and sympathetic nerve systems we pick up from others the influences surrounding them and radiate to others the influences surrounding us. The thought-atmosphere of other persons affects us and the result of this impingement should tell us something about them. If we feel out of harmony with them, if we are uneasy in their presence, if we get depressed, distressed, or disturbed through being with them, then we had better protect ourselves by avoiding such persons and not exposing ourselves to their contact. But if we are to protect ourselves against the destructive and dark mental atmospheres of the persons we are forced to meet through the exigencies of our circumstances, it is needful to build up a strong and superior mental fort within ourselves by daily and repeatedly concentrating on self-improvement through right thinking.
-- Notebooks Category 16: The Sensitives > Chapter 14: The Sensitive Mind > # 15