The natural philosopher

Without the specific context of the letter and page 32 that you are referring to, it's challenging to provide a precise answer. However, I can offer some general insights into why a writer might assert that no one philosopher concerns themselves with the entirety of philosophy. Philosophy is a vast field with numerous branches and sub-disciplines, such as ethics, metaphysics, epistemology, aesthetics, and political philosophy, among others. Philosophers often specialize in one or a few of these areas. It is not uncommon for a philosopher to focus their efforts on a particular aspect or problem within philosophy, rather than attempting to address the entire field comprehensively. Philosophy has a rich history, with contributions from various cultures and eras. Different philosophers have developed their own unique ideas and systems of thought. Due to the diversity of philosophical traditions and the vastness of philosophical literature, it can be challenging for any one philosopher to cover the entirety of philosophy in their work. Philosophy deals with profound and complex questions about existence, knowledge, ethics, and the nature of reality. These questions often have deep and intricate layers, making it difficult for a single philosopher to address all of them thoroughly. Philosophy is not static; it evolves over time. New ideas and perspectives continually emerge, challenging and expanding upon earlier philosophical views. This dynamic nature of philosophy means that no single philosopher can encompass all of its developments and changes. Philosophy often intersects with other disciplines, such as science, psychology, sociology, and mathematics. Philosophers may collaborate with experts from these fields when addressing specific issues, but it is rare for one philosopher to be an expert in all these areas. So, when a writer asserts that no one philosopher concerns themselves with the entirety of philosophy, they are likely acknowledging the complexity, diversity, and specialized nature of the field, as well as the practical limitations of any individual philosopher's work. Instead, philosophy often progresses through the collective efforts of many thinkers, each contributing to a particular aspect of philosophical inquiry.