 The other and better known argument for this postulate is first found in the Critique of Pure Reason’s Canon. Like his argument for the postulate of God, Kant also argues that we must postulate the immortality of the soul as a necessary condition for the distribution of happiness in the highest good. Given the exigencies of the natural order, this distribution cannot be secured within this order. We must therefore posit a “future life”, a “Kingdom of Grace” where “every happiness awaits us as long as we do not ourselves limit our share of it through the unworthiness to be happy” (A812/B840). Hence, in the First Critique, the purpose of the afterlife is to provide a domain for the highest good’s distribution of happiness.