" Anxiety and excitement are cousins; they can be mistaken for each other at points. They have many features in common—the bubbling, carbonated feel of the emotion, the speed, the wide eyes and racing heart. But where excitement tends to take you up, into the higher, brighter levels of feeling, anxiety pulls you down, making you feel like you have to grip the earth to keep from sliding off as it turns. "
― Maureen Johnson , The Vanishing Stair (Truly Devious, #2)