In the Critique of Practical Reason, Kant argued that this Highest Good for Humanity is complete moral virtue together with complete happiness, the former being the condition of our deserving the latter. Unfortunately, virtue does not insure wellbeing and may even conflict with it. Further, there is no real possibility of moral perfection in this life and indeed few of us fully deserve the happiness we are lucky enough to enjoy. Reason cannot prove or disprove the existence of Divine Providence, nor the immortality of the soul, which seem necessary to rectify these things. Nevertheless, Kant argued, an unlimited amount of time to perfect ourselves (immortality) and a commensurate achievement of wellbeing (insured by Divine Providence) are “postulates” required by reason when employed in moral matters.