Rashi, R. Yonah #1: The verse is abbreviated ¹ . It means, my son, cease to err from sayings of Da'as, in order that you will hear Musar and contemplate it. Chadal Lishgos is like Chadal mi'Lishgos. Similarly, "v'Chadal La'asos Pesach" (Bamidbar 9:13) is like v'Chadal mi'La'asos. R. Yonah - this is if you desire Chachmah and love to learn Musar. Lishmo'a is Ba'avur Lishmo'a, just like "Imri Li ² Achi Hu (Bereishis 20:13). Shemi'ah is understanding, like "Lev Shome'a" (Melachim I, 3:9). The verse comes to teach Da'as, for one who errs in his deeds and does not contemplate the way of Chachmah. It will not be straight in his eyes or pleasant to his Nefesh, since his deeds are the opposite of Chachmah and Musar. "Yir'as Hashem Reishis Da'as" (above, 1:7). Our verse discusses a son who desires Chachmah, but he persists in folly - "Liknos Chachmah v'Lev Ayin" (17:16). It warns him to abandon the way of folly.

R. Yonah #2: This refers to verse 26. Cease to plunder your parents and shame them, in order to hear Musar.

R. Yonah #3: My son, cease listening to those who tell you to deviate from sayings of Da'as. Resha'im who choose an evil path, they chastise sons [to stop them] from going in a good path - "u'Musar Evilim Iveles" (16:22). There are Resha'im who recognize their sin, and their Yetzer overpowers them. Other Resha'im choose evil, conquest and audacity. These are praiseworthy Midos in their eyes! They raise their children on these Midos - "Anshei Damim Yisne'u Sam", "v'So'avas Rasha Yeshar Derech" (29:10, 27).

Malbim: Cease to need to hear Musar of the Letz due to erring about Imrei Da'as. When you will put to your heart Imrei Da'as, it will be utterly clarified that a Ben Mevish plunders his parents, and you will repent from the deeds.