Traveling Through Civilization: Beacon

"Beacon?" "Yes." "What's that?" The mechanical voice replied: "Maybe it's a weapon, maybe it's a certain immortal god, or it's an inconspicuous stone on the roadside, or it's even... A civilization." "How do I find it?" "Cultivation, control, guidance, detachment." "Then... Can I return to Earth?" "Of course." It says. "That's what you have to do."