At night there is no light, and colors are not seen;
Hence we know what light is by its opposite, darkness.
 Rumi, Masnavi (1273). copy citation

add
Author Rumi
Source Masnavi
Topic darkness light
Date 1273
Language English
Reference Masnavi, Book I
Note Translated by Edward Henry Whinfield
Weblink https://en.wikisource.org/wiki/Masnavi_I_Ma'navi/Book_I

Context

“The light that lights the eye is also the heart's Light; The eye's light proceeds from the Light of the heart. But the light that lights the heart is the Light of God, Which is distinct from the light of reason and sense. At night there is no light, and colors are not seen; Hence we know what light is by its opposite, darkness. At night no colors are visible, for light is lacking. How can color be the attribute of dark blackness? Looking on light is the same as looking on colors; Opposite shows up opposite, as a Frank a Negro.” source