Who said "The grass sea holds secrets only the wise understand."?

This quote is attributed to Drogo.

The grass sea holds secrets only the wise understand. - Drogo

"The grass sea holds secrets only the wise understand."

Drogo Knowledge

"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"

"We're not just after treasure. We're preserving history."

"The mind is humanity's greatest tool."

"A tidy room reflects a tidy mind."

"You can learn a lot about a person by how they keep their space."