The increasing spiritualization and idealization of sensuality in the course of civilization, =notwithstanding= the persistence of the elementary intensity of the sexual impulse, is associated with the fact to which we have already alluded--namely, the preponderance of the brain characteristic of the genus homo--a preponderance which was unquestionably gradually acquired, and arose in consequence of an accumulation of original variations which gave their possessors a certain advantage in the struggle for existence. Thus very gradually the primary, instinctive, still powerful animal ego underwent expansion into the secondary ego (in Meynert’s sense), into the =spiritual personality=, to which a fixed foundation was given by the possession of =speech=. With some justice the origin of speech has been singled out as extremely significant for the development of the feeling of love; and the conquest of the primitive animal instinct has been, above all, attributed to this faculty. A. Cabral, in his interesting work, “La Vénus Génitrix” (Paris, 1882, p. 155), expresses the opinion that speech and song developed solely on account of sexual relations; and he alludes in support of this view to the well-known manifold noises made by various animals in conditions of sexual excitement. It is very significant in this connexion that anthropological science has proved, as an important fact in racial psychology, that the development of poetry =preceded= that of prose.[33] The original form of speech was rhythmical noise, a poem, a song. And we saw above that this was subservient to more suggestive purposes, and, above all, to sexual allurement. Thus the primitive natural connexion between speech and sexuality appears somewhat probable. With these earlier erotic noises and alluring tones were subsequently associated the first elements of intellectual comprehension, the first =thoughts=. This “withdrawal of mankind from pure instinct,” which Schiller, in his essay on the earliest human society, describes as the “most fortunate and most important occurrence in human history,” from which time the struggle towards freedom may be said to begin, gradually enabled the higher =feeling-tones= of sensation to become more predominant. The elementary impulses became associated with sensations of pleasure and pain as psychical reactions. The “organic sensations” entered the sphere of consciousness, and so gave rise, in association and reciprocal working with the higher sensory stimuli, to the psychico-emotional roots of the impulses. Thus, in the sexual sphere, out of pure voluptuousness, the simple instinctive impulse towards copulation, arose =love=, whose essence is an intimate association of physical sensations with feelings and thoughts, with the entire spiritual and emotional being of mankind.[34]