Who said "I am not afraid of death. I am afraid of failure."?

This quote is attributed to Daenerys Targaryen.

I am not afraid of death. I am afraid of failure. - Daenerys Targaryen

"I am not afraid of death. I am afraid of failure."

Daenerys Targaryen Fear

"I am the blood of Old Valyria. I am the dragon."

"A dragon is not a slave."

"I will take what is mine with fire and blood."

"The night is dark and full of terrors, but so is the day."

"Face your fears with courage."

"You can't live your life in fear."

"Snakes. Why'd it have to be snakes?"

"Fear is just another obstacle to overcome."