At the start of the text, Balmes focuses on the significance of certainty as the foundation of philosophy, arguing that acknowledging our inherent capacity for certainty is essential before delving deeper into philosophical questions. He critiques historical skepticism, refuting the notion that humans can live without certainty. By examining the interplay of sensation and perception, Balmes articulates the distinction between real and ideal truths, contending that while sensations inform our experience, they do not provide a comprehensive basis for philosophical knowledge. This opening lays the groundwork for his deeper explorations of transcendental science and the relationship between consciousness and objective reality throughout the volume. (This is an automatically generated summary.)