The prison is one the mind builds around itself, its walls made of thought, of fear, of the story you keep telling about who you are. Go forth is not spoken to some distant future but to you, now. The door was never locked from outside; it opens the instant you awaken from your thinking into the simple awareness of this moment.
Once free, those released are fed everywhere they walk. When you live from awareness rather than compulsion, nourishment is no longer confined to some future arrival. This moment, wherever you happen to stand, becomes the high pasture where you are sustained.