From
https://suttacentral.net/sn46.54/en/bodhi?reference=none&highlight=false
“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."
Does the passage in bold mean that by practicing metta a monastic can achieve absorption so steady s/he can see things not normally seen in an object?
Is there something special about being able to see the repulsive and unrepulsive where and when you want?
I’ve heard the term “clear comprehension” before does it have a special meaning beyond just seeing something clearly?