Isaiah 27 used against every collective picture of the end. We are called and redeemed one by one, so redemption is not something that takes place as the world has been taught to believe, suddenly, where billions of us are brought to the end together: the play is on and we are playing it, and we go through the obstacle race. The reason he gives at 1483 is the strongest form of it - you are too wonderful, you are unique and you cannot be duplicated, so you cannot be called in pairs. At 1351 it is the eschatological trumpet of the same chapter, gathering the dispersed out of Assyria and Egypt; at 1979 it is what happens when the plan unfolds within you; at 1981 it is the answer to anyone who hears 'one being' and imagines a single person - it is one being made up of all. He pairs it with Isaiah 48, where the calling is by name: you are not known as humanity, you are known singly, individually. About five lectures, and it is the verse that keeps his universalism (M-no-one-can-be-lost) from becoming a crowd.