A number of other books has been written about the "Seven Universal Principles" or "Seven Laws of Nature" using somewhat more modern language, but The Kybalion is the classic.
K.
While in times long gone by, these may have seemed to be only arbitrary spiritual principles, they are in accord with the view of quantum physics.
If you apply them consciously in your life, your life will change.
This is not just a theory or a Philosophy - the principles, being universal, are down-to-earth practical.
A number of other books has been written about the "Seven Universal Principles" or "Seven Laws of Nature" using somewhat more modern language, but The Kybalion is the classic