The infra-red and ultra-violet rays of light also were occult a few years ago, and are so yet to the majority of people.

All mental forces fall properly into this category as is admitted in the case of hypnotism, exhibiting as it does, the power of one mind over another.

It is clear then, that the common application of the word occult, since it depends upon the experience of the speaker - for what is hidden to one may be perceived by another - is wholly arbitrary."

Humanity has ever feared what it does not understand.

"The word carries with it an air of mystery, it is true. But all forces are mysterious to those who have not studied them. What is mysterious to the ignorant is obvious to the learned."

The simplest conveniences of modern civilization are mysterious to an untutored primitive mind.

"Such a mind is wont to attribute their power to some supernatural agency. But there is nothing supernatural - nothing that is not governed by natural laws. Above and below, all obey those by which they manifest. And while these laws are uncomprehended, any phenomenon seems mysterious."