Melancholy was the dominant note of his temperament, he thought, but it was a melancholy tempered by recurrences of faith and resignation and simple joy.
His blade of human knowledge, natural astuteness particularised by long association with cases in the police courts, had been tempered by brief immersions in the waters of general philosophy.
There are no more uses of "tempered" in the book.
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If you had only given me some hint, if you had only broken your word with me a couple of times, if you had been bad-tempered or impatient with me—if you had been a lesser man, maybe I could have taken what I saw you doing.
Harper Lee -- Go Set a Watchman
For the rest of the day, I’m short-tempered and distracted.