A central point of any research on Wittgenstein's work is the transition of his thought from the early philosophy of the Tractatus Logico-Philosophicus to the later conclusions of the Philosophical Investigations. The "Philosophical Remarks" are chronologically placed between these two works and provide the interpreter with the key or keys to understand this transition and at the same time to delve into the philosopher's views on the texture of language, spirit, and mathematics. It is one of the most important philosophical studies of our century.