Those who have even a preliminary acquaintance with the structure and laws of the inner spheres of existence know that complete isolation of human beings is a figment of the imagination. Whether they desire it or not, all persons are constantly acting and interacting upon each other by their very existence, even when they do not establish any contact on the physical plane. There are no limits to the spreading of the influence of the individual. The magnetic influence of the subtle spheres knows no barriers of national frontiers or any other conventional limitations.
Good thoughts as well as evil thoughts, cheerful moods as well as gloomy moods, noble and expansive feelings as well as petty and narrow emotions, unselfish aspirations as well as selfish ambitions -all these have a tendency to spread out and influence others, even when they are not expressed in words or deeds.
The world of mental life is as much a unified system as the world of gross matter. The gross world as a vehicle of spiritual life has its own indubitable importance, but the links and connections existing between different persons can by no means be fully estimated if one merely considers the tangible transactions that take place in the gross world.
– Discourses 7th Ed., p 186