They have as king over them the angel of the bottomless pit. His name in Hebrew is Abaddon, and in Greek he is called Apollyon. The first woe has passed; behold, two woes are still to come. Revelation 9:11-12 (ESV)
"What is dark clings to what is light and so enhances the brightness of the latter. A luminous thing giving out light must have within itself something that perseveres; otherwise it will in time burn itself out. Everything that gives light is dependent on something to which it clings, in order that it may continue to shine." - The I Ching: Li / The Clinging, Fire (30).