sentences:  The antithetical relation of spirit and nature shows itself in this, that the realm of the purely spiritual is formed of a plurality of substances, of unitary and integral real principles, each of which must ever retain its unity and its integrity; while nature, which was created a single substance, a single real principle, has in its process of differentiation lost its unity for ever, and has brought forth, and still brings forth, a multiplicity of forms or individuals.For this very reason nature, in her organic individual manifestations, each of which is only a fragment of the universal nature-substance, can only attain to thought without self-consciousness.Self-conscious thought, on the other hand, is peculiar to the spirit, since self-consciousness, the thought of the Ego, presupposes the substantial unity and integrity of a free personality.