निगद्यतेऽन्तःकरणं मनो धी -रहङ्कृतिश्चित्तमिति स्ववृत्तिभिः ।मनस्तु सङ्कल्पविकल्पनादिभि -र्बुद्धिः पदार्थाध्यवसायधर्मतः ॥ ९५ ॥
In plain words
The one inner instrument goes by four names, depending on what it is doing: manas, buddhi, ahaṅkāra, and citta. It is called manas when it wavers between resolve and doubt; it is called buddhi when it settles firmly on what a thing is.
Close to the Sanskrit
The inner instrument, according to its own functions, is termed manas, buddhi, ahaṅkāra, and citta. Manas [is so-called] by functions such as resolve and doubt; buddhi, due to its nature of determining objects.