俱舍論記 4.47

4.47

「三摩地謂心一境性」者，等持力能令心王於一境轉。若無等持，心性掉動不能住境。從強說心，理實亦令諸心所法於一境轉。故《正理》云「令心無亂取所緣境不流散因，名三摩地。」言三摩地者，此云等持。即平等持心、心所法，令專一境，有所成辨。故《婆沙》一百四十一云「問：何名等持？答：平等持心，令專一境，有所成辨，故名等持。」

"Concentration (samādhi) means one-pointedness of mind": the power of concentration is able to make the sovereign mind operate on a single object. If there were no concentration, the nature of the mind would be restless and unable to abide in the object. One speaks of the mind because it is predominant; in principle, it also causes all mental factors to operate on a single object. Therefore, the Nyāyānusāra states: "The cause that makes the mind take the intentional object without distraction and without scattering is called samādhi." As for the word samādhi, here it is translated as 'equipoised retention' (dengchi). That is, equally holding the mind and mental factors, making them focus on a single object so that something is accomplished. Therefore, the Mahāvibhāṣā, fascicle 141, states: "Question: What is called equipoised retention? Answer: Holding the mind in equipoise, making it focus on a single object so that something is accomplished, is therefore called equipoised retention."