Abstract In this essay, I examine the motive of inner truthfulness in the moral philosophy of Kant, which came to the fore in his work in the 1790s. Truthfulness and sincerity are interpreted as the roots of all morality. In the first chapter, I present two interpretations of inner honesty from two different perspectives: in relation to a duty to oneself and to the issue of conscience. The second chapter (the core of the essay) works out the main demand of truthfulness, especially in the context of the theory of radical evil from Religion within the Boundaries of Mere Reason. As a last step, I show that with the motive of truthfulness, Kant’s philosophy meets the thinking of F. Nietzsche, with its emphasis on sincerity.

中文翻译：

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诚信是道德的根本。康德（和尼采）

摘要在本文中，我考察了康德道德哲学中内在真实性的动机，该动机在康德1790年代的工作中脱颖而出。诚实和真诚被解释为所有道德的根源。在第一章中，我从两个不同的角度对内在诚实进行了两种解释：关于对自己的责任和对良心问题的了解。第二章（论文的核心部分）提出了对真实性的主要要求，特别是在纯粹理性的范围内，来自宗教的激进邪恶理论的背景下。作为最后一步，我表明，以诚实为动机，康德的哲学符合尼采的思想，强调诚实。