This is a study focusing on the philosophical method of Maurice Merleau-Ponty. My approach begins with his style of writing, which furnishes some clues that concretely reveal his way of thinking. This makes perceptible an active process working in the texts. Working from here , the right approach seems to be a certain methodus negativa, opening a vast field of investigations, not only in existentialism, phenomenology, and ontology, but also , metaphysics. That is why, finally, such investigations cannot avoid a confrontation with Cartesianism.