This study focused on showing the purpose dimension in belief in the Last Day in the Holy Qur'an and comparing it to the intellectual side of theology. It also followed the extent to which faith thought was affected by external influences which made it, for some time, move away from the divine purposes of pure faith based on the Holy Qur'an and the true Sunnah of Mohammed Peace Be Upon Him. Then, it offered an insight into the purpose dimension in the encyclopaedia The Burhan Alhaqq by Shaikh Ahmed bin Hamad Al-Khalili – may Allah protect him – which inaugurated a new era and an enlightened thought which re-established faith thought according to our era's thought and tongue. This was carried out via focus on faith's practical functional dimension that achieves the individual's intellectual and practical balance and thereby fulfils the principal purpose from his creation which is worshipping Allah and obeying Him in one's speech and deeds. And being the successor of Allah on earth, he seeks to pursue prosperity in the interest of the universe and those who live on it. In this study, the researcher utilised the following research methods: the inductive, the analytical, the inferential, and the comparative methods. The study comprised two parts preceded by a preface which undertook the task of defining key terms in the research, tracing back the scientific development of the purpose thought, comparing purposes of Sharia to those of faith, explaining the reasons behind the absence of the faith dimension in the purpose thought, and finally presenting Shaikh Ahmed bin Hamad Al-Khalili – may Allah protect him – and his encyclopaedia The Burhan Alhaqq. The subsequent sections are organised according to the Last Day's happenings, and the study of each step and its purposes was carried out first through the Qur'an, then through theology, and finally through The Burhan Alhaqq. The first chapter spoke of death and tomb's torment. This first phase starts with the soul's departure from the body, passing through Barzakh (isthmus) and tomb's bliss or torment. This was made possible through induction and interpretation of Qur'anic verses and linking them with their contexts and their linguistic and implied purpose meanings. The second chapter speaks of the Last Day from resurrection to eternity based on the Qur'an and theology and the extent to which the purpose dimension of this day was shown in The Right's Proof. This is the most important part because it reveals a good deal of the Unseen world. Hence, there was so much disagreement which lay at the basis of the faith that widened the circle of differences between different sects and doctrines and had implications on faith, behaviour, and destiny. The study concluded that the purpose dimension in belief in the Last day was apparent in The Right's Proof encyclopaedia, even though it was not explained independently. This trend makes faith go beyond its abstract linguistic essence to have a greater influence in the intellectual, spiritual, and practical spheres. Among faith's purposes, one can cite monotheism and servitude to none but Allah, Man's righteousness in both worlds, inhabiting the earth, and therefore achieving the functional dimensions of belief in the Last Day by linking faith to work, this results in a feeling of individual responsibility and self-control which improves behaviour as well as the state of society. Thus, psychological security is achieved via linking one's course in life to the just and eternal destiny. Hence, there is an urgent need to renew faith's intellectual discourse based on the Holy Qur'an and the true and steady prophetic Sunnah, and to present it in a dialectic method that takes into account the exigencies of our era and the modes of thinking of different generations, away from the classical theological debates. Even though those debates could preserve faith for a while, they were at the root of much of the divisions that arose thereafter, and which led to the fact that many Muslims departed from the purposes of true faith and its spiritual and behavioural teachings. And because the main purpose of legislating is the preservation of the Uma's integrity, and the pursuing of its goodness, its righteousness is conditional on the goodness of its faith and its readiness for renewal in the face of all misconceptions. All this testifies to the importance of the method outlined in The Right's Proof encyclopaedia.