ABSTRACT. Much has been made of the 'Transcendental Idealism' in Wittgenstein's Tractatus Logico Philosophicus, particularly the influence of Schopenhauer on Wittgenstein's remarks on solipsism. It has even been suggested that Wittgenstein's commitment to idealism survives into his later work. The proper understanding of this influence, however, shows the most important relation to Kant's transcendental idealism to be on a meta-philosophical level that balances idealism against realism, resulting in a position that is neither. The 'truth' in idealism and realism show that neither position is correct: the Tractatus is a roughly Kantian attempt to constrain metaphysical theorising, albeit in a far more severe way than Kant's own philosophy. The resulting position is mystical quietism.