Kathavatthusutta 2.3

2.3

Sace panāyaṃ, bhikkhave, puggalo pañhaṃ puṭṭho samāno ekaṃsabyākaraṇīyaṃ pañhaṃ ekaṃsena byākaroti, vibhajjabyākaraṇīyaṃ pañhaṃ vibhajja byākaroti, paṭipucchābyākaraṇīyaṃ pañhaṃ paṭipucchā byākaroti, ṭhapanīyaṃ pañhaṃ ṭhapeti, evaṃ santāyaṃ, bhikkhave, puggalo kaccho hoti.

When an individual is asked a question, if it needs to be answered categorically and they answer it categorically; or if it needs analysis and they answer after analyzing it; or if it needs a counter-question and they answer with a counter-question; or if it should be set aside and they set it aside, then that individual is competent to hold a discussion.