[‘Abdu’l‑Bahá tells] us that “when a lump of iron is cast into the forge, its ferrous qualities of blackness, coldness and solidity, which symbolize the attributes of the human world, are concealed and disappear, while the fire’s distinctive qualities of redness, heat and fluidity, which symbolize the virtues of the Kingdom, become visibly apparent in it.” As He averred, “ye must in this matter—that is, the serving of humankind—lay down your very lives, and as ye yield yourselves, rejoice.”

– Universal House of Justice, 28 December 2010 – To the Conference of the Continental Boards of Counsellors