5. undone—(Ex 33:20). The same effect was produced on others by the presence of God (Jud 6:22; 13:22; Job 42:5, 6; Lu 5:8; Re 1:17).
lips—appropriate to the context which describes the praises of the lips, sung in alternate responses (Ex 15:20, 21; Isa 6:3) by the seraphim: also appropriate to the office of speaking as the prophet of God, about to be committed to Isaiah (Isa 6:9).
seen—not strictly Jehovah Himself (Joh 1:18; 1Ti 6:16), but the symbol of His presence.
Lord—Hebrew, "Jehovah."