Karen Marie Moning:
American fantasy author. She is best known for the Fever series, all five planned installments of which have since been published. Moning is also known for the Highlander series.

Nobody looks good in their darkest hours. But it’s those hours that make us what we are.

The quote is a meditation on character forged through adversity. The first sentence is a frank, almost comforting admission — when we’re at our lowest, we are not at our best; we may be broken, ugly, desperate, or weak. There is no shame in that. The power lies in the second sentence: those very moments of darkness are the crucible that defines us. It is not our polished, comfortable days that reveal who we truly are, but the moments of crisis, grief, or failure — how we respond to them shapes our fundamental character.
Origin:
Strictly speaking, this is not a traditional idiom or proverb, but an original literary quote. It echoes the sentiment of older sayings like “It is always darkest before the dawn,” or the idea that adversity builds character (cf. Nietzsche’s “What doesn’t kill me makes me stronger”), but Moning’s phrasing is her own literary invention, voiced through the world of her urban fantasy fiction. The quote appears in “Bloodfever: Fever Series” (2007), p. 210, published by Delacorte Press. A longer, more complete version also circulates: “Nobody looks good in their darkest hour. But it’s those hours that make us what we are. We stand strong, or we cower. We emerge victorious, tempered by our trials, or fracture by a permanent, damning fault line.”
Author:
The quote is by Karen Marie Moning, an American author born in 1964, best known for her paranormal fantasy “Fever Series” — a world of magic, ancient creatures, and fierce heroines set largely in Dublin. The series spans multiple novels, including “Darkfever”, “Bloodfever”, “Faefever”, and “Shadowfever”, and has earned a devoted following for its blend of dark atmosphere and emotionally resonant writing, of which this quote is a fine example.