" Yuyeh sesh,” Tolya called after her in Shu.
“Ni weh sesh,” she shouted over her shoulder. And then she was gone.
“What does that mean?”
“It’s something our father taught us,” Tolya replied. “Yuyeh sesh: ‘despise your heart.’ But that’s the direct translation. The real meaning is more like ‘do what needs to be done—be cruel if you have to.’”
“What’s the other part?”
“Ni weh sesh? ‘I have no heart. "

― Leigh Bardugo , The Grisha Trilogy (The Shadow and Bone Trilogy, #1-3)