Who said "A Dothraki without his horse is not whole."?

This quote is attributed to Drogo.

A Dothraki without his horse is not whole. - Drogo

"A Dothraki without his horse is not whole."

Drogo Nature

"I am the stallion who mounts the world"

"A Dothraki hears a word and takes it as a command"

"You are of my blood. That is enough"

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

"Nature teaches us about beauty."

"Nature teaches us patience and wisdom"

"Sometimes it snows in April."

"Every town has a soul, and Twin Peaks has a troubled one."