The reason for limiting the author of *Al-Usool ath-Thalathah* to these issues and not the rest of the issues and principles

The questioner : Yes. May Allah reward you. This question is: What is the reason the author (may Allah have mercy on him) made these four issues obligatory for a person to learn, while there are other issues that a person is also required to learn?

The Shaykh : Because these are principles. Because these principles are the foundation upon which the rest of the Shari'ah is built.