The quote "Sometimes it's not the person who changes, it's the mask that falls off" suggests that people may not always undergo a genuine transformation, but rather their true nature becomes evident when they can no longer conceal it.
The quote implies that some individuals may present a facade or wear a metaphorical "mask" to hide their true selves, but eventually, their real character is revealed.
In essence, the quote speaks to the concept of authenticity and the idea that people might pretend to be something they are not for various reasons. When their true intentions or behaviors are unveiled, it can feel like a significant change, even though it is a revelation of their genuine self. The quote encourages skepticism and the need to look beyond surface appearances. It serves as a reminder to be cautious of forming judgments based solely on initial impressions and to pay attention to behavior patterns over time.