俱舍論記 10.221

10.221

「定者謂聖至故名正定」者，此別解定。定者謂聖，聖謂已有無漏道生，能遠離諸惡不善法，故名為聖。謂若有人斷見等惑，便能獲得畢竟不退離繫得故，定盡煩惱、定得涅槃。於正性中定，故名正定。諸有漏道亦證離繫，非能定盡惑，故不名正定。

Regarding "The determined refers to the noble one ... hence called correctly determined": this separately explains "determined". "The determined" refers to the noble one. "Noble one" means that the uncontaminated path has already arisen in them, and they are able to keep far away from all bad and unwholesome phenomena; hence they are called "noble". It means that if a person cuts off the defilements of views and so forth, they then obtain the possession of definitive and non-retrogressive disjunction; thus they are determined to exhaust afflictions and determined to attain nirvāṇa. Because they are determined within the correct nature, they are called "correctly determined". The contaminated paths also realize disjunction, but are not able to definitively exhaust afflictions, and are therefore not called correctly determined.