Charak Samhita
तद्वदज्ञोऽज्ञमध्यस्थः कश्चिन्मौखर्यसाधनः। स्थापयत्याप्तमात्मानमाप्तं त्वासाद्य भिद्यते ॥७६॥
Similarly, a talkative unknowledgeable person may pretend to be an apta- a trustworthy knowledgeable authority (in Ayurveda) - while among other ignorant people, but when he comes across a true apta, his facade is shattered.
english translation
tadvadajJo'jJamadhyasthaH kazcinmaukharyasAdhanaH। sthApayatyAptamAtmAnamAptaM tvAsAdya bhidyate ॥76॥
hk transliteration by Sanscript