I also found it interesting how deliberately Horace told Locke:
"GODSPEED, JOHN"..especially considering Horace's last name is
'GOODSPEED'..
Godspeed being a wish for good fortune and a
prosperous journey. This is effectively the island (or Jacob, lol) wishing Locke
good-luck (in finding his purpose)..which of course Locke believes in:
Claire: "Do you believe in luck?"
Locke: "I believe in many things"