book of the Lord - the volume in which the various prophecies and other parts of Scripture began henceforward to be collected together (Isa 30:8; Dan 9:2).
Seek - (so Isa 8:16, Isa 8:20; Joh 5:39; Joh 7:52).
no one ... fail - of these prophecies (Mat 5:18).
none shall want ... mate - image from pairing of animals mentioned, Isa 34:15 (“mate”); no prediction shall want a fulfillment as its companion. Or rather, “none of these wild animals (just spoken of) shall be wanting: none shall be without its mate” to pair and breed with, in desolate Idumea.
my ... his - Such changes of person are frequent in Hebrew poetry.