So this book called al-Uṣūl al-Thalāthah is from the best books of ʿaqīdah (creed) for the seeker of knowledge who is at the beginners level, or at an intermediate level. That means that no one from amongst the students of knowledge is without need of it for the explanation of the correct ʿaqīdah  and whatever opposes it. Rather, no one from amongst the Muslims under obligation is free of need from it. So it is built to be memorised and have its meaning understood, and it is also befitting of being taught by the teachers and Scholars, not to mention that the issue of ʿaqīdah discussed herein are of an introductory nature, with respect to the knowledge of the Islamic  ʿaqīdah, which should be studied before every other book.