Twofold purity 兩重清淨（本然清淨、客塵清淨／煩惱障清淨、所知障清淨）

Twofold purity (Tib. དག་པ་གཉིས་ལྡན་, Wyl. dag pa gnyis ldan) —

1. Firstly, purity in the sense that it is always pure by its very nature (Tib. ངོ་བོ་ཡེ་དག་, ngowo yé dak; Wyl. ngo bo ye dag), and secondly, purity in the sense that all the adventitious stains have been purified (Tib. གློ་བུར་བྲལ་དག་, lobur dral dak; Wyl. glo bur bral dag).
2. Alternatively, the phrase twofold purity can refer to purity of the two kinds of obscuration, emotional and cognitive.