Therefore he who has crossed that bank, if blind, ceases to be blind; if wounded, ceases to be wounded; if afflicted, ceases to be afflicted. Therefore when that bank has been crossed, night becomes day indeed, for the world of Brahman is lighted up once for all.

In plain words: Once someone crosses over to the Self, the blind is no longer blind, the wounded is no longer wounded, and the suffering one no longer suffers. For that person night turns into day, because the world of Brahman is always full of light.