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A mind lively and at ease, can do with seeing nothing, and can see nothing that does not answer.
— Jane Austen · Emma

Behind the line May contain spoilers.
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An editorial interpretation.
This describes a mind so genuinely engaged and untroubled that it doesn't need external stimulation to stay occupied. Austen suggests that real ease of mind can find meaning even in apparent emptiness, because a lively, settled mind responds to whatever it encounters, however little there seems to be.
Context reviewed