Kant’s enigmatic term Gesinnung baffles many readers of Religion within the Bounds of Bare Reason. This study clarifies the notion in Kant’s theories of both general moral decision-making and specifically religious conversion. It is argued that Kantian Gesinnung is volitional, referring to a person’s principle-based choice to live a certain way. More specifically, interpreted as principled ‘conviction’, Kantian Gesinnung is a religiously manifested, moral form of Überzeugung (‘convincing’). This is confirmed by a detailed analysis of the 169 occurrences of Gesinnung and cognate words in Religion. It contrasts with what is suggested by translating Gesinnung as ‘disposition’, which reinforces a tendency to interpret the notion more metaphysically, and also with Pluhar’s translation as ‘attitude’, which has too strongly psychological connotations.