Musar zu Mischlej 19:4

And behold that the desire placed in the heart of man is the root of all of his actions. Therefore, if he refines the desire - instead of all the limbs serving it, he will draw them after the intellect. So they will accompany him and serve him; and all of his actions will be proper, as it is stated (Proverbs 21:8), "but he is pure and straight in his actions." (And it appears to me that he is understanding, "but he is pure," [as] meaning to say, that he is pure from desire; "and straight in his actions," [as] all of his actions are assumed to be refined and straight. And that is something that can be learned from its [context], as its opposite is written after it - "The desire of the wicked is set upon evil" [Proverbs 21:10].) And it is [also] stated (Proverbs 13:19), "Desire niheyeh is sweet to the spirit." Niheyeh [here] is like broken, as [its usage in] (Daniel 8:27), "I was broken (niheyeti), and languished." It is stating that when a man breaks his desire - even for things that are permissible - it renders his spirit successful. So this trait is sweet to it. For the intellect raises its hand and is victorious. "But to turn away from evil is abhorrent to the stupid" (Proverbs 21:8): The stupid, who do not break their desire but rather always pursue the desires of people - when their desire confronts them [to do a] sin or any bad thing, they will not veer from it. And they are called stupid because of [their] pursuit of pleasures - as it is stated (Proverbs 21:20), "and a stupid man will swallow them." And it is stated (Isaiah 5:11-12), "Ah, those who chase liquor from early in the morning, etc. Who have lyre and lute, etc.; but who never give a thought to the plan of the Lord, etc." And it is [also] stated (Proverbs 13:25), "but the belly of the wicked is empty." And it is [further] stated (Malachi 2:3), "and I will strew dung upon your faces, the dung of your festivals." And our Rabbis, may their memory be blessed, said (Shabbat 151b), "These are people for which all their days are like festivals." And it states (Proverbs 18:1), "He who isolates himself pursues his desires; he disdains all competence." Its explanation is, one who seeks to go after his desire and his will, will be isolated from any friend or countryman. As admirers and companions will distance themselves them from him, since the desires and measures of people are [all] different - the will of this one is not like the will of that one. However if he will follow the path of the intellect, many friends will join themselves to him and his admirers will be many. And they said regarding ethics, one who [insists] upon his measures will have many [against] him. And it is possible to explain, "He who isolates himself pursues his desires," about this matter itself: A man is isolated from every brother and friend, by the desire that he seeks. And since he seeks to go after his will - because of that, his companions distance themselves from him. [It is] like the matter [of], "but a poor man loses his friend" (Proverbs 19:4). "He disdains all competence": One who follows his desires will not only sin in one thing. Rather he will disdain every thing in the Torah, since he will transgress all of it - like the wording (of Proverbs 20:3), "but every fool disdains."