 Much interested in the thought of Nietzsche and Wittgenstein (he contributed a 'Vorwort zum "Tractatus logico-philosophicus), Heller had also a natural attraction for the basic issues raised by Martin Heidegger in his works on Being, which were directly relevant to his own reflections on the nature of Reality.An obstacle to a deeper analysis of Heidegger's "œuvre" was presented by that writer's questionable but imperfectly explored association with National Socialism.At an early stage in his life Heller, in a bid to 'absolve' Heidegger in his own mind, went so far as to undertake a special trip to post-war Germany to meet the renowned philosopher in person; but his 'Why?'