Who said "The horizon calls to those brave enough to answer."?

This quote is attributed to Drogo.

The horizon calls to those brave enough to answer. - Drogo

"The horizon calls to those brave enough to answer."

Drogo Adventure

"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"

"The greatest adventure is life itself."

"The adventure of life begins with a single step."

"Adventure finds you when you stop running."

"Fortune and glory, kid."