harden

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References in classic literature ?
Perhaps a hobby hardens with age; and my hobby has been silence.
Had I seen it depicted in a novel, I should have thought it unnatural; had I heard it described by others, I should have deemed it a mistake or an exaggeration; but when I saw it with my own eyes, and suffered from it too, I could only conclude that excessive vanity, like drunkenness, hardens the heart, enslaves the faculties, and perverts the feelings; and that dogs are not the only creatures which, when gorged to the throat, will yet gloat over what they cannot devour, and grudge the smallest morsel to a starving brother.
Despair got hold of me, the despair that hardens the heart.
Respect the naturlangsamkeit which hardens the ruby in a million years, and works in duration in which Alps and Andes come and go as rainbows.