Marie de l’Incarnation wrote a substantial body of correspondence of which only a few hundred letters remain. Alongside her dialogue with correspondents from France and New France, the Ursuline tirelessly pursues an interior conversation consisting of prayers to God. This exchange is a place of secrets, a space that one would have trouble putting into words, let alone letters; however, she is entreated by her son and other correspondents to, nonetheless, disclose it. Her readers thus participate in another conversation, one which always returns to the “eternal Word.” This Other inhabits all of her letters and, imperceptibly, turns her readers into third party spectators and witnesses to the mystery. In so doing, Marie de l’Incarnation invites each of her readers to participate in the mystical experience, using the space of the letter to open up another dialogue in which there is neither writer nor reader.