A quotation from Kant’s Critique of Pure Reason and right after it a quotation from young Heidegger’s 1919 lecture “Basic Problems of Phenomenology”, which eloquently contrasts Heidegger’s position from that of both Kant and, to a certain extent, that of Husserl’s.
“I should think that the examples of mathematics and natural science, which have become what they now are through a revolution brought about all at once, were remarkable enough that we might reflect on the essential element in the change in the ways of thinking that has been so advantageous to them, and, at least as an experiment, imitate it insofar as their analogy with metaphysics, as rational cognition, might permit.” (Immanuel Kant, CPR)
“There is no iurare in verba magistri [swearing to the words of a master] within scientific research. The essence of a genuine generation of researchers and of subsequent generation lies in its not losing itself on the fringe of special questions, but rather to return in a new and genuine way to the primal sources of the problems, and to take them deeper. With that, it is likewise implied that the continuity of phenomenological-philosophical research has a unique character and has nothing to do with imitating the forms of progress in the individual sciences, e.g. in mathematical natural science. Husserl’s essay, “Philosophy as a Strict Science” is generally misunderstood in this sense, which is much easier to do in that Husserl himself gladly and often exemplifies mathematical natural science.” (Martin Heidegger, BPP)