What “mischief” does the speaker do?

In Robert Frost’s “Mending Wall,” the speaker says, “Spring is the mischief in me,” because he wonders whether he can get his neighbor to question why they need a wall. He asks, “Why do they make good neighbors?” and points out that their land has no need for a wall. So his mischief is questioning the tradition of mending it, not tearing it down himself.

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