Does the one who supplicates use what is transmitted, or does he use what he composes?

The Shaykh : I do not understand Imam Ahmad’s words in this absolute sense, which I think you are going around and around about. He means, and Allah knows best, that if the matter is between supplicating with what is transmitted and what he wants to compose, then he dislikes the latter and commands the former. But it is not required of every supplicant to be a memorizer of the Sunnah or a memorizer of all the supplications transmitted from the Prophet (peace and blessings be upon him). First, and second, to know which of them are authentic and which are not is something few people can provide in this clarification and detail. So, if the one praying or the supplicant wants to supplicate with something, the least I can say is that he does not memorize anything from the Sunnah with which he wants to supplicate to his Lord (Mighty and Majestic). I do not believe Imam Ahmad dislikes this, but his words should be directed to the case where one is knowledgeable about what is transmitted, or about what was taken, as we said earlier, from a transmitted hadith. That is undoubtedly better than innovating or composing a phrase with which he supplicates to his Lord (Mighty and Majestic). Imam Ahmad’s words should be directed in this way.
The student : It seems that the one who understands the emphasis of the Shaykh al-Islam in interpreting Imam Ahmad’s words responds to this by saying, "If the supplicant asks his Lord for a beautiful slave girl," and the Shaykh al-Islam responds by saying, "And who said that this supplication is prescribed?" or "And who said that this supplication is permissible?" So, consider this specification as being from the category of supplications that involve transgression.

The Shaykh : What is the nature of the transgression?
The student : That he specified or deviated from the transmitted supplications by saying, "O Allah, give me a beautiful slave girl, or a house, or a residence."

The Shaykh : Yes, what is the transmitted supplication that serves as a substitute for this?
The student : It seems he is referring to the supplication, "Our Lord, give us good in this world and good in the Hereafter, and protect us from the punishment of the Fire," if he keeps its meanings in mind and includes these matters among them.

The Shaykh : This returns to the detail I mentioned to you, my brother.
The student : So the matter revolves around this. May Allah reward you with good. There is one remaining issue.

The Shaykh : Yes.
The student : The issue of Qur'anic supplications and the emphasis of some scholars. Ah.

The Shaykh : Keep your words in mind, because a Hanafi jurisprudential issue came to my mind. If a person says in his supplication during prayer, "O Allah, marry me to so-and-so," they specify and say that his prayer is invalid. Why? Because this is considered the speech of people, and the speech of people invalidates the prayer. But the truth is that this is not speech; it is supplication. The most that can be said about it is what I mentioned regarding the Shaykh al-Islam, with the condition to which I drew attention, which is clear.
The student: Yes.

The Shaykh : Okay, please, what do you want?