In Sartre’s lecture, Existentialism is a Humanism, he famously summarized the primary principle of existentialism with the line: “Existence precedes essence.” Essence, here, means the qualities of a thing that create its purpose. For example, Sartre referenced how a paper knife is designed with a specific purpose in mind before it is made, and only once it is given a predetermined purpose and designed accordingly, is it manufactured into being; in which case, its essence precedes its existence. With the exception of itself, humanity does this with nearly everything it makes. As rational
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