Charak Samhita
द्विविधातुखलुतद्विद्यसम्भाषाभवति- सन्धायसम्भाषा, विगृह्यसम्भाषाच ॥१६॥
॥ Two types of discussions॥ Discussion with experts is of two types- friendly discussion and hostile discussion.
english translation
dvividhAtukhalutadvidyasambhASAbhavati- sandhAyasambhASA, vigRhyasambhASAca ॥16॥
hk transliteration by Sanscript