Thought possesses healing power. […] Someone who understands these things may say to you that certain thoughts give health, and the person who hears this may at a certain time be affected by this or that illness. Indeed, my dear friends, the fact that we cannot at present be relieved of all illnesses by the mere power of thought is due to an ancient heritage. But are you able to say what illnesses would have overtaken you if you had not possessed the thoughts? Could you say that your life would have been passed in its present degree of health if you had not possessed these thoughts? In the case of a person who has applied himself to spiritual science guided by Anthroposophy and who dies at the age of 45 years, can you prove that, without these thoughts, he would not have died at 42 or 40 years of age? Human beings tend always to think from the wrong direction when they deal with these thoughts. They direct their attention to what cannot be bestowed upon them, by reason of their karma, but do not pay attention to what is bestowed upon them by reason of their karma. But if, in spite of everything contradictory in the external physical world, you direct your look with the power of inner confidence which you have gained through intimate familiarity with the thoughts of spiritual science, you then come to feel the healing power, a healing power which penetrates even into the physical body, refreshing, rejuvenating — the third element, which the Christ as the Healer brings with his never ceasing revelations into the human soul.
Source: Rudolf Steiner – GA 187 – The Birth of Christ in the Human Soul – Basel, December 22, 1918
Translated by Olin D. Wannamaker