Everyone's primary impulse in life is to be happy. That is our birthright and our Divine perogative. Harmony is the fundamental Law of our being. Therefore, if we think, see, feel or speak in inharmony about any other part of creation, we are that moment building thought forms of mental substance and energizing them with our feeling and thought. This is not conjecture.
Thought does build form.
That Law, we cannot possibly escape. Just because the average person's eyes do not see the form immediately, is no proof that it does not exist. There are some, whose faculty of sight has been attuned highly enough to be able to see thought forms in the aura of others, and sometimes their own, have been shown them. The day is not far distant when a mechanical devise will be built which will as surely show people their own thought and the form it takes, as the mirror now shows them their bodies. This takes no stretch of the imagination to prove it.