Which sign assures john at he should definitely travel east?

The sign that assures John he should definitely travel east is likely a directional sign or a symbol indicating that east leads to his desired destination. It could also be a metaphorical sign, such as a feeling or intuition that suggests traveling in that direction will bring him beneficial experiences or opportunities. Additionally, if he encounters friendly locals or hears positive stories about the east, this could further reinforce his decision to head that way.