首楞嚴義疏注經 8.578

8.578

欲愛漸微，於己室家亦減愛欲，故無全味。味，著也。言淨居者，不由雜穢，揀異行邪也。超日月者，以善增故。愛心又減，身則又昇，故生忉利。忉利，此云三十三，帝釋居處也。

Desire and affection gradually become faint, and toward their own households they also decrease love and desire; hence they have 'no full savor.' 'Savor' means attachment. 'Pure cohabitation' means not relying on promiscuous defilement, distinguishing it from committing misconduct. 'Transcending the sun and moon' is because their good has increased. As their mind of affection decreases further, their bodies ascend further; hence they are born in Trāyastriṃśa. Trāyastriṃśa translates here as 'Thirty-Three', the dwelling place of Śakra.