לָכֵ֛ן גָּלָ֥ה עַמִּ֖י מִבְּלִי־דָ֑עַת וּכְבוֹדוֹ֙ מְתֵ֣י רָעָ֔ב וַהֲמוֹנ֖וֹ צִחֵ֥ה צָמָֽא׃
Por tanto mi pueblo fué llevado cautivo, porque no tuvo ciencia: y su gloria pereció de hambre, y su multitud se secó de sed.
Ibn Ezra
בצחצחות In drought. Comp. צחא is dry (5:13). It is the opposite of fulness.
Or HaChaim
Our paragraph is also concerned with awakening sleeping hearts. If someone pursues a path which is not good this is only proof that he has not acquired knowledge about G'd and the good he would derive by serving the Lord. We may therefore understand the conditional "if you will not listen" in the sense of "if you fail to understand." Failure to understand the advantages of serving the Lord may result in someone refusing to do so. The prophet Isaiah summed it up when he said that Israel went into exile as a direct result of lack of knowledge (Isaiah 5,13).