Who said "I have learned that death is not the end, but a transition."?

This quote is attributed to Daenerys Targaryen.

I have learned that death is not the end, but a transition. - Daenerys Targaryen

"I have learned that death is not the end, but a transition."

Daenerys Targaryen Death

"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."

"Death doesn't scare me anymore."

"Death and I are old friends."

"Welcome to my world."

"Death is just the beginning."