Closely linked to his History of Philosophy (Fundamentals Collection, numbers 21 and 22), this Initiation now offered by Felipe Martínez Marzoa reflects considerable teaching experience. It is not, however, a book that adheres to the rules of official programs, nor does it attempt to expose "a bit of everything" at the cost of avoiding all that is difficult in a development, even elementary, of the themes of The philosophy. The author has deliberately selected a series of basic questions for a rigorous initiation reading - the syllogism and the proposition, the universal, the theory of ideas, categories, the essence of mathematical truths, symbolic logic, etc. - and makes them available to the reader who, desiring something more than familiarization with defining formulas, aspires to take the first steps in a field that can never be traversed without personal effort.