One can delineate the domain of philosophy however one likes, but in its search for truth, philosophy is always concerned with human existence. Authentic philosophizing refuses to remain at the stage of knowledge […]. Care for human existence and its truth makes philosophy a 'practical science' in the deepest sense, and it also leads philosophy—and this is the crucial point—into the concrete distress of human existence.

While it [tolerance] is more or less quietly and constitutionally withdrawn from the opposition, it is made compulsory behavior with respect to established policies.

That which is cannot be true.

The intellectual is called on the carpet... Don't you conceal something? You talk a language which is suspect. You don't talk like the rest of us, like the man in the street, but rather like a foreigner who does not belong here. We have to cut you down to size, expose your tricks, purge you.

This (functional - E.W.) language controls by reducing the linguistic forms and symbols of reflection, abstraction, development, contradiction; by substituting images for concepts. It denies or absorbs the transcendent vocabulary; it does not search for but establishes and imposes truth and falsehood.

Under the rule of a repressive whole, liberty can be made into a powerful instrument of domination.

The sickness of the individual is ultimately caused by and sustained by the sickness of his civilization