Jamieson, Fausset and Brown on Isaiah 29:11

11. of all--rather, "the whole vision." "Vision" is the same here as "revelation," or "law"; in Is 28:15, the same Hebrew word is translated, "covenant" [Maurer].

sealed--(Is 8:16), God seals up the truth so that even the learned, because they lack believing docility, cannot discern it (Mt 13:10-17; 11:25). Prophecy remained comparatively a sealed volume (Da 12:4, 9), until Jesus, who "alone is worthy," "opened the seals" (Re 5:1-5, 9; 6:1).