I "care" about everything that is real in the sense that it exists and is not an abstraction of something that exists. That doesn't necessarily mean I take life seriously though. Tell me what life is and i'll tell you if I take it seriously or not.

I don't take life, in the general sense of a human being's perception of "life," seriously. That is, to grow up, go to school, get a job, get married, find a religion, have some hobbies, try to eat right, socialize, make something of yourself etc.

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