瑜伽論記 8.47

8.47

就別解中，已證入已得者，此有兩解：一云，身在欲界入初定故名已證入，生彼地故名已得；二云，正在定故名證入，雖不入而得故名已得。

In the individual explanation, regarding "having already realized and entered, having already attained," there are two explanations: One says that one's body resides in the desire realm and enters the first dhyāna, hence it is called "having already realized and entered"; being born in that stage is called "having already attained." The second says that directly being in concentration is called "realized and entered"; although not entering, having attained it is called "having already attained."