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내가 네게 보응하는 날에 네 마음이 견디겠느냐 네 손이 힘이 있겠느냐 나 여호와가 말하였으니 이룰지라
'Iron' signifies natural truth, and consequently, the natural sense of the Word. At the same time, 'iron' also signifies the natural light of mankind. These two definitions together signify the power of truth.
In Revelation 9:9, it signifies something strong.
In Deuteronomy 8:9, 'iron' signifies natural or rational truth.
(Odkazy: Arcana Coelestia 425)