Promising ourselves is familiar, yet some find it philosophically troubling. Though most of us take the promises we make ourselves seriously, it can seem mysterious how a promise made only to oneself could genuinely bind. Moreover, the desire to be bound by a promise to oneself may seem to expose an unflattering lack of trust in oneself. In this paper I aim to vindicate self-promising from these broadly skeptical concerns. Borrowing Nietzsche’s idea of a memory of the will, I suggest (...) that self-promising involves an activity of the will, aimed at the preservation and protection of one’s values. I explain how, understood in this way, these promises can indeed bind, and show that the motivation for making them need not involve mistrust or other alienated attitudes. I then turn to interpersonal promising, arguing that this same activity of the will is required for sincerely promising others: in effect, making a sincere promise to another requires making a promise to oneself. Attention to this under-appreciated aspect of interpersonal promising enriches our understanding of all promises, and helps to correct a narrow and distorted picture of what it means to be bound. (shrink)