Anlass [occasion, Latin: ob-, toward, cadere-, to fall] is one of many words from the root lassen [to let] which Heidegger frequently employs, for instance, in sich einlassen [to engage in, to enter into], veranlassen [to occasion, to induce], etc. Here Heidegger uses Anlass [occasion] like Auslösen [releasing] in a deeper existential sense of letting something come into presence, bringing something forth out of concealment into unconcealment, i.e., what the Greeks thought as bringing-forth in physis (nature) and poiesis (arts, crafts). The “occasioning,” which is ontologically prior to “causality,” is the doctor’s existential “being-with” [Mitsein] the patient, in contrast to treating him as an “object” of medical expertise. Concerning the difference between Heidegger’s distinctions between “cause,” “occasion,” and “occasioning,” see Basic Writings, p. 292 f. – [Krell  , GA89  ]