"You sound so grave, Tessa. Don’t frighten her." It was Zachariah, coming to stand behind Tessa’s chair.
"I’m not!" Tessa said with a laugh; she had her head tipped back, and Clary wondered if that was how she herself looked, looking up at Jace. She hoped so. It was a safe and happy look, the look of someone who was confident in the love they gave and received. " 

─ City of Heavenly Fire, Cassandra Clare.