To be "on edge," you are literally not centered — not being in your spiritual center.

The remark plays on the spatial metaphor embedded in the idiom “on edge.” If you are on an edge, you are off-balance and easily tipped—an image the author maps onto inner life. “Centered” here suggests a stable spiritual or emotional core (groundedness, presence, alignment with values), while “on edge” signals anxiety, reactivity, and disconnection from that core. The quote implies that agitation is not merely a mood but a symptom of losing contact with one’s inner center; returning to calm, then, is framed as a process of re-centering rather than suppressing feelings. It reflects a common theme in contemporary spiritual and self-help discourse: equanimity comes from inner alignment, not external control.