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Abhidhammapiṭaka · Vibhaṅga · Vol. 35 · Section 634

[634] "Devoid of dullness and drowsiness (thīna-middha)": because that dullness and drowsiness has been given up, disgorged, released, abandoned, relinquished, abandoned and relinquished — therefore it is said: "devoid of dullness and drowsiness." "He dwells": … Therefore it is said: "he dwells."

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.