Who said "A dragon's health is measured by the strength of its will."?

This quote is attributed to Drogon.

A dragon's health is measured by the strength of its will. - Drogon

"A dragon's health is measured by the strength of its will."

Drogon Health

"I am fire. I am death."

"Dracarys."

"A dragon is not a slave."

"I will burn them all."

"You can't expect to be happy if you're surrounded by mess."

"Health and happiness - these are true wealth"

"How can you live like this? It's like a pigsty!"

"You're going to get sick living like this."