What are the laws of evolution and harmony?

All the laws of Nature run directly through and exist on the spiritual plane, and in the spiritual worlds, as well as here. 

But all of these laws are not generally understood and some of them need to be explained. For instance, there is the law of Evolution, by which all things obtain their development or growth, and attain to different kingdoms of life, and planes of life. Through that law, they finally attain completion—through innumerable changes, births and deaths experienced in connection with the mineral, vegetable and animal kingdoms, as well as with the spiritual kingdoms, of which there are many.

Then, there is the law Harmony. This is the law by which all things work together, and in vibratory correspondence with each other, and by which discord is prevented.

Then there are the law of Love, the law of Affinity, and various other laws, too numerous to mention. Each of these laws should be studied and understood because they exist in the spiritual, as well as in the physical worlds, and are of vital importance to you on every plane of life, and in every world in which you will find yourself in the course of your journey to completion.

Fragments of Spiritual Knowledge