Is the refutation of scepticism a central objective for Kant? Some commentators have denied that the refutation of either theoretical or moral scepticism was central to Kant's concerns. Thus, in his recent book Kant and the Fate of Autonomy, Karl Ameriks rejects 'taking Kant to be basically a respondent to the skeptic'. According to Ameriks, who here has Kant's theoretical philosophy in mind,

What Kant goes on to propose is that, instead of focusing on trying to establish with certainty – against skepticism – that the objects of common sense exist, let alone that they have philosophical dominance, or, in contrast, on explaining that it is only the theoretical discoveries of science that determine what is objective, one can rather work primarily to determine a positive and balanced philosophical relation between the distinct frameworks of our manifest and scientific images.

Kant's moral theory has received trenchant criticism for its rigorism. Rigorism generally denotes an overemphasis on rules in moral theory, and a consequent neglect of the roles of emotional receptivity and perception in moral judgement. Critics of Kant's ethics have invoked the term rigorism with reference to any one of three overlapping features of Kant's moral theory. Usually rigorism designates the 'rigid and insensitive uniformities of conduct' that result from the mechanical application of rules. Occasionally it refers to the excessively strict moral standard implied by Kant's conception of the good will. But some critics object to rigorism in just the sense in which Kant himself understood and embraced it: as referring to moral theories that admit only two types of moral character, namely good and evil ones. The complaint, which Kant was fully aware of, is that this bipolar view of character is woefully inadequate to our experience of the gradations of virtue and vice.

Kant famously said he 'had to deny knowledge (Wissen) in order to make room for faith (Glaube)’ (B xxx). But what exactly was his conception of Glaube, and how does it fit into his epistemology? In the first Critique it is not until the concluding Method section that he explicitly addresses these issues. In the Canon of Pure Reason he lists three questions that sum up ‘all interest of my reason’: What can I know? What should I do? What may I hope? (A 805/B 833). Kant here put hope on the agenda of philosophy. In his essays on history he argued that we can hope for secular progress in the development of human culture; but in his moral and religious philosophy he was also concerned with eschatological hopes that we can perfect our characters in a life after death, and that the moral governor of the universe will ensure that happiness is eventually proportionate to virtue. About immortality and the existence of God, his constant refrain is that we can have only a practical kind of faith (Glaube).

Like several prominent moral philosophers before him, such as St Augustine and St Thomas Aquinas, Kant held that it is never morally permissible to tell a lie. Although a great deal has been written on why and how he argued for this conclusion, comparatively little has been written on what, precisely, Kant considered a lie to be, and on how he differentiated between being truthful and being candid, between telling a lie and being reticent, and between telling a lie and other forms of linguistic deception. That is to say, very little has been written on the scope of Kant's prohibition against lying. In this article I will argue that the scope of the prohibition against lying is narrower than it is commonly supposed to be.