瑜伽論記 16.8

16.8

於中，初問答總說四門之意，為欲示現遍一切種差別門故者，為欲顯示遍於諸法是處非處差別門義故，今說此第三門義。

Within that, it first explains the purpose of the four approaches in general through question and answer: regarding 'in order to demonstrate the approach of distinctions pervading all varieties', it means that in order to demonstrate the meaning of the approach of distinctions of possibilities and impossibilities pervading all phenomena, this third approach's meaning is now stated.