“adversity is the oil that feedeth the flame of this Lamp” “which the Hand of Divine power hath lit”

Behold how in this Dispensation the worthless and foolish have fondly imagined that by such instruments as massacre, plunder and banishment they can extinguish the Lamp which the Hand of Divine power hath lit, or eclipse the Day Star of everlasting splendor. How utterly unaware they seem to be of the truth that such adversity is the oil that feedeth the flame of this Lamp! Such is God's transforming power. He changeth whatsoever He willeth; He verily hath power over all things.... 

- Baha’u’llah  (‘Gleanings from the Writings of Bahá'u'lláh’; The Compilation of Compilations, Vol. II, Opposition)