July 14

Consider the visible sun: Although it shineth with the same radiance upon all existence, and at the behest of the Lord of Revelation bestoweth light on all things, yet in each place it becometh manifest and sheddeth its bounty according to the potentialities of that place. For instance, in a mirror it reflecteth its own disk and shape, and this is due to the clarity of the mirror itself; through a crystal it maketh fire to appear; and in other things it showeth only the effect of its shining, but not its full disk. And yet, through that effect, by the command of the Creator it traineth each thing according to the capacity of that thing, even as thou dost observe. 

In like manner, colours become visible in each object according to its nature. For instance, in a yellow glass the rays shine yellow; in a white glass they are white; and in a red glass red rays are visible. These variations proceed from the object itself, not from the light. And if a place be shut away from the light, as by walls and a roof, it will be entirely bereft of the light of the sun and deprived of its rays. 

- Baha’u’llah  (‘The Seven Valleys’, 2019 revised translation by the Baha’i World Centre; included in ‘The Call of the Divine Beloved’)