Proud and passionate city—mettlesome, mad, extravagant city!
O quick mettle, rich blood, impulse and love! good and evil!
I Join the group of clam-diggers on the flats, I laugh and work with them, I joke at my work like a mettlesome young man; In winter I take my eel-basket and eel-spear and travel out on foot on the ice—I have a small axe to cut holes in the ice, Behold me well-clothed going gayly or returning in the afternoon, my brood of tough boys accompanying me, My brood of grown and part-grown boys, who love to be with no one else so well as they love to be with me, By day to work with me, and by…
There are no more uses of "mettle" in the book.
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The Trials are a test of my mettle.
Sabaa Tahir -- An Ember in the Ashes
But I will say, too, that for every man who showed no fear or hesitance, there were three or four or five others whose mettle was as unashamedly wan and mortal as yours or mine.