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No. Coal mining may be your life, but it's not mine. I'm never going down there again. I wanna go into space.
— Homer ‧ October Sky

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker rejects the mine as a future, acknowledging it's someone else's life but not theirs, and states a far bigger ambition: space. The contrast between underground and sky makes the refusal sound like a leap of aspiration.
Context reviewed