No man ever treasured the joys of the spirit more than did Spinoza; but he did not because of that nourish a savage antagonism against the body. The very bases of his philosophy of the mind saved him from any such disastrous folly. What Havelock Ellis says "We know at last" Spinoza knew all the time--"that it must be among our chief ethical rules to see that we build the lofty structure of human society on the sure and simple foundations of man's organism." It is because Spinoza knew this so thoroughly and remembered it so well that he devotes so much of his attention to the nature of the human mind and the human emotions in a treatise on ethics. Mind and body are not intrinsically alien or inimical to one another. They are coöperative expressions of the one reality. The mind is the idea of the body and "in proportion as one body is better adapted than another to do or suffer many things, in the same proportion will the mind, at the same time, be better adapted to perceive many things." Purely psychologically, all that we can ever discover about the regulating influence glands have upon personality can only go to corroborate, not to improve this general position. And morally, the implications are equally far-reaching and profound. The virtue of the mind is not to despise or reject but to understand and transform. And it clearly must be more excellent for the mind to know both itself and the body than it is for the mind to know itself alone. For natural science is the result when the mind organizes into a system what are, in their own nature, simply apprehensions of bodily existences; and art is the result when the mind transfuses with an ideal quality of its own what are, in their own nature, simply apprehensions of bodily excellences of form or motion, color or sound. Matter is, in its nature, no more hostile to spirit than body is alien to mind. Paradise is not a non-or super-physical realm; it is a physical realm made harmonious with the ideality of the soul. Spirit is an appreciation, a transmutation of matter. For the lover, the physical embrace is a spiritual revelation.