The Preface to the Phenomenology is one of the greatest philosophical undertakings of all times, constituting no less an attempts than to reinstate p… - Herbert Marcuse

Dialectical logic undoes the abstractions of formal logic and of transcendental philosophy, but it also denies the concreteness of immediate experience. To the extent to which this experience comes to rest with the things as they appear and happen to be, it is a limited and even false experience. It attains its truth if it has freed itself from the deceptive objectivity which conceals the factors behind the facts — that is, if it understands its world as a historical universe, in which the established facts are the work of the historical practice of man.

Non-operational ideas are non-behavioral and subversive. The movement of thought is stopped at barriers which appear as the limits of Reason itself.

Understanding finds nothing but itself when it seeks the essence behind the appearance of things. ‘It is manifest that behind the so-called curtain, which is to hide the inner world, there is nothing to be seen unless we ourselves go behind there, as much in order that we may thereby see, as that there may be something behind there which can be seen.’ P. 111