I have yet to get into Destiny 2:

“To hear the line yourself, put on the Helm of Saint-14 and then go pay him a visit. You can find him hanging around in the hangar, behind an ornate rug…

Destiny 2’s new Guardian, Saint-14, will notice if you wear his helmet

Source: [H]ardOCP – Destiny 2’s new Guardian, Saint-14, will notice if you wear his helmet