וַתְּהִ֨י לָכֶ֜ם חָז֣וּת הַכֹּ֗ל כְּדִבְרֵי֮ הַסֵּ֣פֶר הֶֽחָתוּם֒ אֲשֶֽׁר־יִתְּנ֣וּ אֹת֗וֹ אֶל־יוֹדֵ֥עַ הספר [סֵ֛פֶר] לֵאמֹ֖ר קְרָ֣א נָא־זֶ֑ה וְאָמַר֙ לֹ֣א אוּכַ֔ל כִּ֥י חָת֖וּם הֽוּא׃
And the vision of all this is become unto you as the words of a writing that is sealed, which men deliver to one that is learned, saying: ‘Read this, I pray thee’; and he saith: ‘I cannot, for it is sealed’;
Rashi on Isaiah
the vision of everything All that you used to see in the constellations shall be concealed from you like the words of a letter sealed with wax, which, if they give to read one able to read a letter, he will say, “I cannot, for I see not what is inside, for it is sealed.”
Ibn Ezra on Isaiah
For it is sealed. They cannot understand it; the same meaning is contained in the words, seal the law (8:16),17God told the prophet to leave the prophecy for the present unexplained. as I explained.