In this quote from Garth Nix's "Abhorsen," the Major comments on the idea that when trouble starts, it tends to come all at once, similar to a perimeter that continually receives challenges. The phrase "It never rains but it pours" suggests that difficulties are often overwhelming when they occur. The Major's remark highlights the unpredictable and relentless nature of problems, emphasizing that once one issue begins, others tend to follow quickly.

This statement reflects a common sentiment about how adversity can seem to cluster together, making situations feel more overwhelming than they might appear initially. It underscores the importance of resilience and preparedness in facing many challenges simultaneously, which is a theme often explored in the novel. The quote encapsulates the idea that life's hardships rarely come singly but tend to arrive in groups, demanding strength and endurance from those affected.