Active Forgetfulness and Naturalism

Among the most important concepts in Nietzsche's entire doctrine is what, in the Genealogy of Morals, II, 1, he calls "active forgetfulness", a process which creates a "tabula rasa of the consciousness, to make room for new things, above all for the nobler functions and functionaries, for regulation, foresight, premeditation".  This concept thus offers an alternative explanation to processes that can be generally classified as 'Detachment', and which are typically attributable to some deus ex machina, e. g. 'God', 'Reason', etc.  In other words, Active Forgetfulness is an essential principle in his Naturalism.