The past, when it is merely known historically (that is, as a subject for abstract study), somehow piles itself up outside our real lives. ... I think that one of the duties of a philosopher, if he shows himself worthy of his vocation today, is to attack quite directly those dissimulating forces which are all working toward what might be called the neutralization of the past; and whose conjoint effect consists in arousing in contemporary man a feeling of what I should like to call insulation in time.