Who said "Solitude is where a man finds his true voice."?

This quote is attributed to Drogo.

Solitude is where a man finds his true voice. - Drogo

"Solitude is where a man finds his true voice."

Drogo Solitude

"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"

"Sometimes being the best means being the loneliest."

"Solitude gives us time to reflect on what matters"

"I'm not good with people, never have been."

"I feel like I'm disappearing."