“Again, Bhante, a bhikkhu attends to the perception of light; he focuses on the perception of day thus:’As by day, so at night; as at night, so by day.’ Thsu, with a mind that is open and uncovered, he develops a mind imbued with luminosity. This subject of recollection, developed and cultivated in this way, leading to obtaining knowledge and vision.”
Aṅguttara Nikaya 6:29
The definition of mind in Buddhism is to know something that mind grasp as its object. When we know and feel that everything is dark and painful, let’s envision, and attend to, luminous light to push away the darkness and pain in and around us.