Charak Samhita
साध्यासाध्यविभागज्ञोयःसम्यक्प्रतिपत्तिमान्। न स मैत्रेयतुल्यानांमिथ्याबुद्धिंप्रकल्पयेत् ॥२२॥
So a physician who can distinguish between curable and incurable diseases, and who possesses the right applications, will not subscribe to the wrong notions prevailing among pseudo- physicians like Maitreya, and say that he will certainly succeed in curing diseases.
english translation
sAdhyAsAdhyavibhAgajJoyaHsamyakpratipattimAn। na sa maitreyatulyAnAMmithyAbuddhiMprakalpayet ॥22॥
hk transliteration by Sanscript