The Tipiṭaka in Three Languages

Suññatavāra

Abhidhammapiṭaka · Dhammasaṅgaṇī · Vol. 34 · Section 242

[242] What, on that occasion, is lightness of mind (citta-lahutā)? That which, on that occasion, is lightness (lahutā) of the consciousness aggregate (viññāṇakkhandha), quickness in changing (lahupariṇāmatā), non-sluggishness (adandhanatā), non-inertness (avitthanatā) — this, on that occasion, is lightness of mind.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 4 other places