2. tender plant--Messiah grew silently and insensibly, as a sucker from an ancient stock, seemingly dead (namely, the house of David, then in a decayed state) (see on Isa 11:1).
      shall grow . . . hath--rather, "grew up . . . had."
      before him--before Jehovah. Though unknown to the world (Joh 1:11), Messiah was observed by God, who ordered the most minute circumstances attending His growth.
      root--that is, sprout from a root.
      form--beautiful form: sorrow had marred His once beautiful form.
      and when we shall see--rather, joined with the previous words, "Nor comeliness (attractiveness) that we should look (with delight) on Him."
      there is--rather, "was." The studied reticence of the New Testament as to His form, stature, color, &c., was designed to prevent our dwelling on the bodily, rather than on His moral beauty, holiness, love, &c., also a providential protest against the making and veneration of images of Him. The letter of P. LENTULUS to the emperor Tiberius, describing His person, is spurious; so also the story of His sending His portrait to Abgar, king of Edessa; and the alleged impression of His countenance on the handkerchief of Veronica. The former part of this verse refers to His birth and childhood; the latter to His first public appearance [VITRINGA].

JFB.