What is the meaning of Ibn Taymiyyah’s statement, “The mere fact that the intended result was achieved through the supplication is not what indicates that it is permissible…”?

Question:
The Honorable Shaykh, may Allah grant you success, says regarding the statement of Shaykh al-Islam Ibn Taymiyyah (may Allah have mercy on him) that the mere fact that the intended result was achieved through the supplication is not what indicates that it is permissible in the Shari'ah.

Answer:
The unlegislated supplication. He means the legislated supplication; there is no issue with that. But his point is the unlegislated supplication, such as “I ask you by your Prophet.” This is not legislated. “I ask you by your Prophet” means swearing by Allah through a creation, or “I ask you by so-and-so, a wali (close friend of Allah) among your servants.” This is not legislated. Even if the intended result is achieved, it does not indicate permissibility. Yes. This is the Shaykh’s point: If one supplicates with an unlegislated supplication and the intended result is achieved, does this indicate the permissibility of that supplication? No, as long as it is not legislated, it does not indicate permissibility.