It’s not true that for you and the newborn to be the same person, we expect for you to be exactly identical; in fact, for you to be the same person, there are actually many ways in which you should be radically different from your newborn self.

The ideal or model way to persist through time is not to stay exactly the same. Instead, it is to change.

Ordinary life offers numerous examples of identity-preserving and purposeful changes. Sometimes, tremendous change suggests features of a person’s essence or deep self. Committing to a relationship, flourishing in a new career or mastering a novel hobby inevitably changes us, but it does so in ways comporting with self-narrative. These changes do not make us seem ‘less ourselves’. Instead, these changes seem to help us become who we are. The history of philosophy evokes purposeful change as central to the self. The ancient Greek philosopher Plotinus invoked the image of self-sculpture. He encourages us to ‘cut away all that is excessive, straighten all that is crooked, bring light to all that is overcast, labour to make all one radiance of beauty. Never cease “working at the statue” until there shines out upon you from it the divine sheen of virtue.’ Purposeful self-modification does not problematise personal identity. Instead, it reveals facets of one’s true self.

The core insight is that, in contrast to a view that identity is really about static persistence or similarity, the self is organic and dynamic. Being the same person over time is not about trying to hold on to every aspect of our current selves; instead, it is about changing purposefully.

If all proceeds correctly, the future self will not be exactly the same as the present self. Instead, the future self should be a purposefully developed – thus different – version of the present self. And often, the future self will represent a blossomed or flourishing version of the earlier self, where the earlier self contained small seeds or hints of the future.

The key is our beliefs about purpose.

– Kevin Tobia, Change becomes you