In this pivotal work, French sociologist Albert Bayet constructs a formidable defense of the scientific method and rational thought against the encroachments of dogma, superstition, and obscurantism. He argues that science is not merely a collection of facts but the primary engine for human progress, intellectual liberation, and moral advancement. Bayet meticulously illustrates how embracing a scientific worldview frees humanity from fear and blind faith, paving the way for a society grounded in evidence, reason, and critical inquiry, making a timeless case for the value of knowledge.