It is the spiritual that frees the individual from the slavery of the sense world--from his selfishness and superficial interests--that teaches him to care less for the things of the flesh, and far more for the beautiful, the good, and the true, and that enables him to pursue high aims regardless of the fact that they may entail suffering and loss in other directions.

This, then, is the "High" in the world; the natural life is the "Low." But what is the relation of the natural to the spiritual life?
In the first place, the spiritual cannot be derived from the natural, inasmuch as the former is immensely superior to the latter, and that not merely in degree, but in its very essence.

The spiritual is entirely on a higher plane of reality, and there cannot be transition from the natural to the spiritual world.

The natural has its limitations, and beyond these cannot go.

So far as the natural world is concerned man can never rise above seeking for pleasure, and making expediency and social approbation the standards of life, hence there is little wonder that those ethical teachers who make nature their basis, deny the possibility of action that is unselfish and free.