Seeing many things, but thou observest not; opening the ears, but he heareth not. Seeing many things "Thou hast seen indeed" - The text has ראית רבית raith rabith, which the Masoretes in the marginal Keri have corrected to ראות רבות reoth rabboth; as indeed one hundred and seven MSS., and five editions, now have it in the text. This was probably the reading of most of the MSS. of their time; which, though they approved of it, out of some superstition they would not admit into their standard text. But these wretched critics, though they perceived there was some fault, yet did not know where the fault lay, nor consequently how to amend it; and yet it was open enough to a judicious eye: רבות rabboth, sic veteres; et tamen forte legendum, ראות reoth, vide cap. Isaiah 6:9." - Secker. That is, ראית ראות raith, reoth, seeing, thou shalt see. I believe no one will doubt of admitting this as the true reading.
But he heareth not "Yet thou wilt not hear" - For ישמע yishma, read תשמע tishma, in the second person; so all the ancient Versions and forty MSS. of Kennicott's, (four of them ancient), and seventeen of De Rossi's, and perhaps five more. Two others have תשמעו tishmeu, second person plural.