To synthesize: according to Evola, the spirit forms the matter, being higher. Every race is vector of a certain spirit, and the fight among the races creates the history through a conflict of different metaphysic values, which therefore cannot but became incarnated as different somatic elements.
Note also in the Mein Kampf:
"Men do not perish as a result of lost wars, but by the loss of that force of resistance which is contained only in pure blood."
cause of the decline of civilisations "can never be found in the
outer world, nor can it ever be explained by purely historical and
human factors", contrary to what was assumed by most racialist
authors, from Vacher de Lapouge to Chamberlain, from Günther to
Hamsun , at that time. To fight purely biological racism, it may be
wondered, in the light of other considerations he made on race either
in 'Revolt against the Modern world' or in 'Il Mito del sangue',
whether Evola deliberately underestimated, not the importance of the
race of the body, for sure, but everything which is biological
conditioning, a biological conditioning which, besides, can only
increase as the psychic-physical constitution of
individuals 'solidifies'.
Naturally, Evola is not wrong in considering that the view according
to which "Unity and purity of blood is at the root of the life and of
the force of a civilisation ; the mixing of blood is the primary
cause of its decline" is an illusion, an "illusion which, besides,
reduces the idea of civilisation to the naturalistic and biological
plane, since it is the plane on which race is conceived of more or
less today". But it is not on that most contingent plane that it is
conceived of by Evola, for whom race is essentially spirit. Thus, if,
instead of being looked at from a naturalistic and biological
standpoint, blood is conceived of as it was by the ancients, as it
really is, that is to say, as the bearer of a force which goes far
beyond the merely historical and human plane, well, then, the view
according to which "Unity and purity of blood is at the root of the
life and of the force of a civilisation ; the mixing of blood is the
primary cause of its decline" is no longer an illusion.