With our five physical sense organs, including the faculties of eye, ear, nose, tongue and body, we experience the external world of visible form, sound, odour, taste, and tangible objects, which represent, rather than the whole world, only some facets of the world. In other words, what we experience, physically or mentally, is just partially true. To fully realize and practice the ultimate truth, the study of Purification of View (ditthivisuddhi) is undoubtedly a great significance. This research, based on The Path of Purification (visuddhimagga) written by Bhadantacariya Buddhaghosa in the fifth century, investigates the text of Purification of View and focuses on a thorough analysis of the ultimate materiality and mentality in the hope of grasping an in-depth insight into the Buddha’s teaching and conducive to the realization of Nirvana. The five aggregates include materiality, viz. the aggregate of matter (rupakkhandha), and mentality, namely, the aggregates of sensation (vedanakkhandha), perception (sabbakkhandha), volitional activities (savkharakkhandha), and consciousness (vibbanakkhandha). There are eight chapters in the thesis: the introduction, the background of the research on Purification of View, the basic theory of matter formation (rupakammatthana) and mental formation (namakammatthana), knowing and seeing of materiality, mentality, and no-self (anatta), the practice of Purification of View, and the conclusion. The aim of this thesis, above all, is to examines the teaching and training of Purification of View. This insightful knowledge is directly experienced by a practitioner manifests itself in the ultimate materiality and mentality, where there is no being or self to claim its own existence.