The article examines the meaning of the other for Kant's idea of autonomy. Autonomy is interpreted, in relation to the universal demand of the ethical, as governing the will by principles. Autonomy as principled self-determination by means of the practical law cannot be understood as the standpoint of an isolated subject. Instead we must understand it as a standpoint taken towards others, which we treat as the aspect of spontaneity, and at the same time as a standpoint taken thanks to others, since others make possible its awakening and development - here the aspect of receptivity is discussed. In this two-way relation between autonomy (enabled by a self-determining goverment by principle) and the other, the character of dialogical mutuality is exhibited: autonomy is the principled considerateness of a good will towards others, and, in order for it to be such, it must be initiated by others.