Before I go any further with this let me state that I’m not a Trotskyist, or a Leninist, or a Stalinist or a Maoist (but I might have been all of the above, with exception of Maoist, at one time or another).

we have the certainty that matter remains eternally the same in all its transformations, that none of its attributes can ever be lost, and therefore, also, that with the same iron necessity that it will exterminate on the earth its highest creation, the thinking mind, it must somewhere else and at another time again produce it”. —
Frederick Engels, from the introduction to ‘The Dialectics of Nature’, 1883.