In the happy night, In secret, when none saw me, Nor I beheld aught, Without light or guide, save that which burned in my heart. - John of the Cross

For the soul that is blind considers falsehood to be falsehood no longer, evil not to be evil, because it puts darkness for light, and light for darkness, and falls into endless disorders.

The little white dove Has returned to the ark with the bough; And now the turtle-dove Its desired mate On the green banks has found. ~ 34

...the clearer the light is, the more it blinds and darkens the pupil of the owl; and the more we look at the sun, the greater is the darkness it causes in our vision ... in the same way, when the divine light of contemplation assails the soul that is not wholly enlightened, it causes spiritual darkness within it.