Authors:

When does it happen?" "It already has," Calla replied. Her eyes opened and fixed on Blue. "And it hasn't yet. Time' circular, chicken. We use the same parts of it over and over. Some of us more than others.

Maggie Stiefvater (2013). “The Dream Thieves (The Raven Cycle, Book 2)”, p.302, Scholastic Inc.
When does it happen? It already has, Calla replied. Her eyes opened and fixed on Blue. And it hasn't yet. Time' circular, chicken. We use the same parts of it over and over. Some of us more than others.