Nihilsim, Absurdism and Existentialism

I don’t even fully understand what the Existentialism is trying to claim, at times it seems as if to suggest personal standards to find meaning at life, b ut at the same time is somehow a reaction to rationalism/empiricism.

Is it the claim that minds manipulate their own ‘truth’?

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What existence that of the organism? What essence? What do they think essence means? (defined by thought and not biology?) What do you mean by ‘nature’ or ‘meaning’

I don’t understand how its a reaction to empiricism/rationality then. People can define the meaning of their lives on personal standards and never decide to randomly jaunt into whimsical belief. Is that what it tries to justify?

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I understand the basic propositions to some extent, I really don’t understand how its supposed to make any real sense. Its never properly defined as to how and why these things are true.

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but abstraction like that is inherent to human nature and concreteness and etc? it seems like a bunch of fuzzily defined concepts with fuzzily defined explanations.

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A definition from another is arbitrary. It is the lack of categorization that keeps one thinking.

Rejoice in what you are not.