You know Heidegger, for a long time, for years and years kept saying that thinking started with questioning, that questioning (fragen) is the dignity of thinking. And then one day, without contradicting this statement, he said "yes, but there is something even more originary than questioning, than this piety of thinking," and it is what he called zusage which means to acquiesce, to accept, to say "yes", to affirm. So this zusage is not only prior to questioning, but it is supposed by any questioning. To ask a question, you must first tell the Other that I am speaking to you. Even to oppose or challenge the Other, you must say "at least I speak to you", "I say yes to our being in common together".