The Tipiṭaka in Three Languages

Suññatavāra

Abhidhammapiṭaka · Dhammasaṅgaṇī · Vol. 34 · Section 248

[248] What on that occasion is proficiency of mind (cittapāguññatā)? That which on that occasion is the proficiency, the proficient quality, the state of proficiency of the aggregate of consciousness (viññāṇakkhandha) — this on that occasion is proficiency of mind.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 5 other places