Chapter II
SENSATIONS AND OUR PERCEPTION OF THEM
Mind's Source of Supplies
Whatever you know or think you know, of the external world comes to you through some one of your five primary senses, sight, hearing, touch, taste and smell, or some one of the secondary senses, such as the muscular sense and the sense of heat and cold.
The impressions you receive in this way may be true or they may be false. They may constitute absolute knowledge
or they may be merely mistaken impressions. Yet, such as they are, they constitute all the information you have or can have concerning the world about you.
Does Matter Exist?
Philosophers have been wrangling for some thousands of years as to whether we have any real and absolute knowledge, as to whether matter actually does or does not exist, as to the reliability or unreliability of the impressions we receive through the senses. But there is one thing that all scientific men are agreed upon, and that is that such knowledge as we do possess comes to us by way of perception through the organs of sense.
If you have never given much thought to this subject, you have naturally