John 12:41 makes two claims that together carry the Trinitarian argument: that Isaiah saw Jesus's glory, and that the glory John attributes to Jesus elsewhere in his Gospel is pre-temporal Shekinah possessed παρὰ σοί before creation. Even granting the unitarian referent of Isaiah 52–53, the Servant's glorification read through John 17:5 is restoration of co-possessed eternal glory, not the elevation of a creature.