Most scholars assume that Kantian moral strength is needed only when it comes to following maxims. However, accounts based on this assumption can be challenged by Kant’s claim that virtue, as moral strength of the human will, can never become a habit because its maxims must be freely adopted in new situations. Even some accounts that are not based on this assumption fail to meet this challenge. By drawing on my interpretation of the Kantian capacity for self-control, I propose a twofold account of moral strength that can accommodate Kant’s point that maxims of virtue must always be freely adopted.