"The Cogito never delivers anything except what we ask it to deliver. Descartes never interrogated it concerning its functional aspect: 'I doubt, I think,' and by having wanted to proceed without a guiding thread from this functional aspect to its existential dialectic, he fell into the substantialist error. Husserl, instructed by this error, remained fearfully on the plain of functional description. By that fact, he never superseded the pure description of appearance as such; he remained fixed on the Cogito; he merits being called, despite his denials, a phenomenist rather than a phenomenologue; and his phenomenism borders at all times on Kantian idealism. Heidegger, wanting to avoid the phenomenism of description that leads to the megatic and antidialectic isolation of essence, directly tackles the existential analytic without passing through the Cogito .…"