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Psychological interpretation
Isaiah 48:10 ('I have refined thee... I have chosen thee in the furnace of affliction'), with Blake's furnaces: man, the immortal being, is cast into the furnaces of affliction and sealed in the grave of this world, not as punishment but to be made perfect, passing through state after state until he is brought out.
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Bible wordings
Isaiah 48:10-11 | I have put you through the furnaces of affliction. For my own sake, I do it, for my own sake, for how should my glory be given to another
Other quotations
Whom God afflicts for secret ends, he comforts and heals and calls him friends