First, what is “the deliverance of the beautiful?” I haven’t encountered the phrase anywhere else in the suttas and can’t recall any positive discussion of beauty as something to be cultivated.
And how, bhikkhus, is the liberation of the mind by lovingkindness developed? What does it have as its destination, its culmination, its fruit, its final goal? Here, bhikkhus, a bhikkhu develops the enlightenment factor of mindfulness accompanied by lovingkindness … the enlightenment factor of equanimity accompanied by lovingkindness, based upon seclusion, dispassion, and cessation, maturing in release. If he wishes: ‘May I dwell perceiving the repulsive in the unrepulsive,’ he dwells perceiving the repulsive therein. If he wishes: ‘May I dwell perceiving the unrepulsive in the repulsive,’ he dwells perceiving the unrepulsive therein. If he wishes: ‘May I dwell perceiving the repulsive in the unrepulsive and in the repulsive,’ he dwells perceiving the repulsive therein. If he wishes: ‘May I dwell perceiving the unrepulsive in the repulsive and in the unrepulsive,’ he dwells perceiving the unrepulsive therein. If he wishes: ‘Avoiding both the unrepulsive and the repulsive, may I dwell equanimously, mindful and clearly comprehending,’ then he dwells therein equanimously, mindful and clearly comprehending. Or else he enters and dwells in the deliverance of the beautiful. Bhikkhus, the liberation of mind by lovingkindness has the beautiful as its culmination, I say, for a wise bhikkhu here who has not penetrated to a superior liberation.
Second, the sutta makes associations between the bramhaviharas and the arupa jhanas. How should I understand these associations? As one example:
“And how, bhikkhus, is the liberation of the mind by compassion developed? What does it have as its destination, its culmination, its fruit, its final goal? Here, bhikkhus, a bhikkhu develops the enlightenment factor of mindfulness accompanied by compassion … the enlightenment factor of equanimity accompanied by compassion, based upon seclusion, dispassion, and cessation, maturing in release. If he wishes: ‘May I dwell perceiving the repulsive in the unrepulsive,’ he dwells perceiving the repulsive therein…. If he wishes: ‘Avoiding both the unrepulsive and the repulsive, may I dwell equanimously, mindful and clearly comprehending,’ then he dwells therein equanimously, mindful and clearly comprehending. Or else, with the complete transcendence of perceptions of forms, with the passing away of perceptions of sensory impingement, with nonattention to perceptions of diversity, aware that ‘space is infinite,’ he enters and dwells in the base of the infinity of space. Bhikkhus, the liberation of mind by compassion has the base of the infinity of space as its culmination, I say, for a wise bhikkhu here who has not penetrated to a superior liberation.