瑜伽論記 17.532

17.532

初中，景云：前六體是不定，後六隨義以明不定，或未圓滿故名不定地。謂未證得方便究竟作意者，已得未至定中，前五作意未得第六，名不定。或雜染故，名不定地至多生愛味者，謂根本地四分定中，退分淨定與愛相出入故名不定地。或不清淨故，名不定地。謂未永害煩惱隨眠者，凡夫伏結得定，以不清淨故名不定也。

Regarding the first: Jing says: 'The first six are in essence non-concentrated; the latter six explain non-concentration according to their meanings. Or, because they are not yet complete, they are called stages of non-concentration: that is, those who have not yet realized the attention of the culmination of expedient means, having attained the preliminary absorption, possess the first five attentions but have not attained the sixth, which is called non-concentrated. Or, because of defilement, it is called a stage of non-concentration up to "frequently giving rise to craving-attachment": that is, within the four divisions of meditative absorption of the root stage, the pure meditative absorption of the division of retrogression alternates with craving, hence it is called a stage of non-concentration. Or, because of non-purity, it is called a stage of non-concentration: that is, those who have not yet perpetually eliminated the latent defilements; when an ordinary being suppresses the fetters to attain meditative absorption, because it is not pure, it is called non-concentrated.'