Who said "In the flames, all weakness burns away."?

This quote is attributed to Drogon.

In the flames, all weakness burns away. - Drogon

"In the flames, all weakness burns away."

Drogon Strength

"I am fire. I am death."

"Dracarys."

"A dragon is not a slave."

"I will burn them all."

"Strength comes from within."

"A woman should be proud of who she is."

"A strong woman can overcome anything."

"The only thing I'm good at is killing."