Jesaja 28:9

"Whom then would he teach knowledge? And to whom make preaching intelligible? To those weaned from the milk? To those removed from the breast? For precept upon precept, precept upon precept, line upon line, line upon line, a little here, a little there!" They sneer at the prophet, that intolerable moralist. They are of age, and free; and he does not need to bring knowledge to them (da‛ath as in Isa 11:9), or make them understand the proclamation. They know of old to what he would lead. Are they little children that have just been weaned (on the constructives, see Isa 9:2; Isa 5:11; Isa 30:18; Ges. 114, 1), and who must let themselves be tutored? For the things he preaches are nothing but endless petty teazings. The short words (tsâv, as in Hos 5:11), together with the diminutive זעיר (equivalent to the Arabic sugayyir, mean, from sagı̄r, small), are intended to throw ridicule upon the smallness and vexatious character of the prophet's interminable and uninterrupted chidings, as ל (= על, אל; comp. יסף ל, Isa 26:15) implies that they are; just as the philosophers in Act 17:18 call Paul a σπερμολόγος, a collector of seeds, i.e., a dealer in trifles. And in the repetition of the short words we may hear the heavy babbling language of the drunken scoffers.

The prophet here complains of the wretched stupidity of this people, that they were unteachable and made no improvement of the means of grace which they possessed; they still continued as they were, their mistakes not rectified, their hearts not renewed, nor their lives reformed. Observe, I. What it was that their prophets and ministers designed and aimed at. It was to teach them knowledge, the knowledge of God and his will, and to make them understand doctrine, Isa 28:9. This is God's way of dealing with men, to enlighten men's minds first with the knowledge of his truth, and thus to gain their affections, and bring their wills into a compliance with his laws; thus he enters in by the door, whereas the thief and the robber climb up another way. II. What method they took, in pursuance of this design. They left no means untried to do them good, but taught them as children are taught, little children that are beginning to learn, that are taken from the breast to the book (Isa 28:9), for among the Jews it was common for mothers to nurse their children till they were three years old, and almost ready to go to school. And it is good to begin betimes with children, to teach them, as they are capable, the good knowledge of the Lord, and to instruct them even when they are but newly weaned from the milk. The prophets taught them as children are taught; for, 1. They were constant and industrious in teaching them. They took great pains with them, and with great prudence, teaching them as they needed it and were able to bear it (Isa 28:10): Precept upon precept. It must be so, or (as some read) it has been so. They have been taught, as children are taught to read, by precept upon precept, and taught to write by line upon line, a little here and a little there, a little of one thin…

28:9-10 The people had become hardened to God’s revelation (1 Cor 14:21).