“Bhikkhus, without directly knowing and fully understanding the eye, without developing dispassion towards it and abandoning it, one is incapable of destroying suffering. Without directly knowing and fully understanding the ear … the mind, without developing dispassion towards it and abandoning it, one is incapable of destroying suffering. But by directly knowing and fully understanding the eye … the mind, by developing dispassion towards it and abandoning it, one is capable of destroying suffering.” sn.iv.90
SN35.111: Ajjhattikāyatanaparijānanasutta
Ajjhattikāyatanaparijānanasutta: Fully Understanding (1) - translated by Bhikkhu Bodhi
Translated by Bhikkhu Bodhi. Source text via SuttaCentral.