Why is a human being is the measure of all things?

The phrase "man is the measure of all things," attributed to the philosopher Protagoras, suggests that human perception and experience shape our understanding of reality. It implies that individuals interpret the world based on their own beliefs, values, and experiences, making subjective human judgment central to defining truth and meaning. This perspective emphasizes the importance of human agency and perspective in shaping knowledge and understanding. Ultimately, it highlights the variability of truth, as it can differ from one person to another based on their unique experiences.