At a time when critical thinking seems to rest on an unshakeable basis, Scheler starts questionning a set of Kant’s typical principles. The one he attacks most strongly is the rationalist scheme from which they all originate. In that respect, specialists explain that the central part of his philosophy opposis feelings to intellect. We do not want to renew this observation, even under a new angle, but rather to unveil the conditions which make it possible. The originality of Scheler’s thinking, beyond his opposition to the all powerful reason, is mostly due to the rigourous and concise building of a phenomenological framework which can supply the tools necessary to the elaboration of his criticism. Indeed, Scheler only subordinates reason to feelings after a long phenomenological work questioning subject and Ego. We here wish to reconstitute this approach, following step by step the way he takes to distance himself from the transcendantal synthesis and unity to become oriented toward a thinking of diversity.