The quote captures a sense of unease and reluctance, comparing the act of resuming a challenging situation to a painful visit to the dentist. The speaker likens their emotional state to someone facing a daunting health issue, suggesting deep-seated apprehension about what lies ahead. This metaphor illustrates the conflict between necessity and fear, highlighting the internal struggle of the individual.

In this context, the mention of "back in the saddle" signifies a return to a familiar yet uncomfortable role or circumstance. The imagery of a "numbed heart" reflects emotional detachment or resignation, while the "prick of misgiving" emphasizes the lingering doubts that accompany such a return. Overall, Beckett’s words resonate with themes of existential dread and the complexity of human emotion in the face of unavoidable realities.