חֲכַם־לֵ֭ב יִקַּ֣ח מִצְוֺ֑ת וֶאֱוִ֥יל שְׂ֝פָתַ֗יִם יִלָּבֵֽט׃
心裡有智慧的必接受誡命；嘴唇說愚妄話的必勞碌困頓。
Rashi
The wise-hearted takes commandments This alludes to our teacher, Moses, for all Israel were busy with the plunder of Egypt, and he was busy with the commandments, as is it said (Exod. 13:19): “And Moses took Joseph’s bones, etc.”
Malbim
A wise-hearted one will take commandments: A wise one is one who acts according to the principles of wisdom, as mentioned above. However it is has already been elucidated that the impulse of the heart counters the wisdom. And [so] every man (including a wise one) has a constant war with the impulse of his heart and the desires that move him to the opposite of the way of wisdom. But a man who is already accustomed to the way of wisdom, to the point that it is second nature for him, and the heart - which is the controlling power within him - no longer arouses [him] to evil at all, is called wise-hearted...
Rashi
but he who talks foolishly will weary Heb. ילבט, an expression of weariness. It appears in Sifre, in the section commencing (Num. 11:1): “And the people were as complainers.” They said, “How much have we wearied (נתלבטנו) on the way!”