In the context of predicting an apocalypse, the idea is that if one makes such a dire forecast, there eventually arises an obligation to fulfill that prediction. This suggests that the act of forecasting an end brings with it a sense of responsibility to manifest it in some way. The quote reflects the pressure that might accompany dire prophecies, particularly in times of social or political turmoil.

This theme is explored in Stacy Schiff's "The Witches: Salem, 1692," where the fabric of society is tested by fear and hysteria. The expectation of catastrophe can lead individuals or groups to take drastic actions, ultimately shaping the course of events. In historical contexts like Salem, the repercussions of such prophecies can be profound, leading to real-world consequences that echo the initial predictions.