Belfast, July 11, 1862
You will admit that I am at a distance of some hundreds of miles from you according to your belief. Now if your senses are your mind and then if I act upon them, I must act outside of your own wisdom. My wisdom, being attached to my senses, does not admit space except as an error, so that distance is an idea, not truth; and according to error, I am at a distance from you. But I am now sitting talking with you and although you have eyes, you cannot see, ears and you cannot hear, yet I am trying to make you understand that I am with you even in your very thoughts and I will tell you how you may see and understand.
Suppose your senses were an instrument and my wisdom wished to communicate to your wisdom some truth. I come to your senses and use them to communicate to your wisdom the fact, but as your wisdom is of this world, you are ignorant of the author and think that the ideas are your own. So watch your feelings and see if there are not some vibrations or strains that pass through the senses that will make the whole body tremble so that you will say that your mind can be affected; then you will see that mind is matter and that it can be changed.
P. P. Quimby