Charak Samhita
मनसस्तु चिन्त्यमर्थः। तत्र मनसो मनोबुद्धेश्च त एव समानातिहीनमिथ्यायोगाः प्रकृतिविकृतिहेतवो भवन्ति ॥१६॥
॥ Functions of mind and preservation of mental health॥ Object of mind: The object of the mind is to think. Proper and improper (excessive, deficient and deviant) association of mind and its ultimate perception (mano-buddhi) causes normal and abnormal perceptions respectively.
english translation
manasastu cintyamarthaH। tatra manaso manobuddhezca ta eva samAnAtihInamithyAyogAH prakRtivikRtihetavo bhavanti ॥16॥
hk transliteration by Sanscript