October 1

…consider the substance of copper. Were it to be protected in its own mine from becoming solidified, it would, within the space of seventy years, attain to the state of gold. There are some, however, who maintain that copper itself is gold, which by becoming solidified is in a diseased condition, and hath not therefore reached its own state.

Be that as it may, the real elixir will, in one instant, cause the substance of copper to attain the state of gold, and will traverse the seventy-year stages in a single moment. Could this gold be called copper? Could it be claimed that it hath not attained the state of gold, whilst the touch-stone is at hand to assay it and distinguish it from copper?

Likewise, these souls, through the potency of the Divine Elixir, traverse, in the twinkling of an eye, the world of dust and advance into the realm of holiness; and with one step cover the earth of limitations and reach the domain of the Placeless. It behooveth thee to exert thine utmost to attain unto this Elixir which, in one fleeting breath, causeth the west of ignorance to reach the east of knowledge, illuminates the darkness of night with the resplendence of the morn, guideth the wanderer in the wilderness of doubt to the well-spring of the Divine Presence and Fount of certitude, and conferreth upon mortal souls the honour of acceptance into the Ridván of immortality. Now, could this gold be thought to be copper, these people could likewise be thought to be the same as before they were endowed with faith. 
- Baha’u’llah  (‘The Kitab-i-Iqan’)