 To live with integrity is not merely to have a coherent life-plan and the courage to realise it, it is to act in a way that is rationally endorsed both by oneself as one acts and one’s future self. To do this, one must act on principles and these principles must be such that they would be rationally endorsed by any future self who reflects on the matter satisfactorily. Hypothetical imperatives tie our present plans and our future actions together; they are necessary for agency, but not sufficient. Categorical imperatives must be brought to bear if the tie between present and future self is to be appropriately binding. A future self must be bound to a project in light of the same principles that illuminated the project’s origin, endorsable in a process of rational reflection parallel to that at work at the project’s origin.