The methodology of the people of the Sunnah regarding "making things good and making things bad"

The Shaykh : That is because what the people of the Sunnah agreed upon, and in which they opposed the Mu'tazilah, is that knowledge of the rulings of the Shari'ah, and knowledge of what is good and what is bad, has no path except through the Shari'ah. So, if this is a matter agreed upon by the people of the Sunnah, and the Mu'tazilah opposed it by saying, "The good is what the intellect makes good, and the bad is what the intellect makes bad," the people of the Sunnah refuted them and said: No, "The good is what the Shari'ah makes good, and the bad is what the Shari'ah makes bad." So, when we come to this hadith: ; what is the path to knowing a good Sunnah? Is it the intellect? Or the Shari'ah? The answer is categorically: it is the Shari'ah. At that point, we say in contrast: . From where do we know that this Sunnah is bad? Is it the intellect or the Shari'ah? The answer—also—is the Shari'ah.
So, if we assume that someone claims that a certain Sunnah is a good Sunnah, we say to him: . If he brings this proof, he has obligated us by the Shari'ah to submit to it. But if he says, as many people say, "My brother, the matter is easy, there is nothing in it, and it is an addition, and the addition of good is good," and similar words that are the speech of the common people and not the speech of the people of knowledge, then the speech of the people of knowledge, as you have heard, is that the intellectual making of things good and bad is one of the doctrines of the Mu'tazilah. The people of the Sunnah say: Making things good and bad is the function of the Shari'ah. So we are with the Shari'ah in making things good and bad.