It was Kant who first rejected the Cartesian premise of the mind's self-transparency: the idea that when it comes to knowing our own minds, we just know what we are thinking or feeling, and do not have to learn how to perceive ourselves thinking or feeling.

It was Kant who first rejected the Cartesian premise of the mind's self-transparency: the idea that when it comes to knowing our own minds, we just know what we are thinking or feeling, and do not have to learn how to perceive ourselves thinking or feeling.

Psychoanalytic categories such as "neurosis", "psychosis", "mania", and "fixation" have become part of our everyday psychological vocabulary and we now routinely interpret states of anxiety, excitement, or depression in terms of physiological factors involving levels of serotonin, adrenalin, or blood sugar. To say that the characterization of thinking has a normative function that is irreducible to neurophysiological processing is not to say that our extant classification of the forms of thinking is incorrigible.

Nietzsche saw that ultimately the problem of nihilism is the problem of what to do with time: Why keep investing in the future when there is no longer any transcendental guarantor, a positive end of time as ultimate reconciliation or redemption, ensuring a pay-off for this investment? Nietzsche's solution - his attempted overcoming of nihilism - consists in affirming the senselessness of becoming as such - all becoming, without reservation or discrimination.

Correlationism rejects metaphysical realism understood as the claim that the way the world is does not depend on how we take things to be. It also rejects the Cartesian corollary, i.e., the claim that the way the mind is does not depend on the way the world is.

If nothing matters, then even the thought that nothing matters doesn't matter. And if it doesn't matter whether anything matters or not, then there's no real difference between believing nothing matters and believing something matters.

Philosophy would do well to desist from issuing any further injunctions about the need to re-establish the meaningfulness of existence, the purposefulness of life, or mend the shattered concord between man and nature. It should strive to be more than a sop to the pathetic twinge of human self-esteem. Nihilism is not an existential quandary but a speculative opportunity.