The Ethics of Successors: Lived Experience and the Convergence of Parfit

In an earlier essay, The Momentary Self, I explored how our sense of a permanent, continuous self might be a very convincing illusion. Consciousness may be less a thread than a reconstruction: a sequence of assembled states that mistake memory for persistence.

For years I have been chasing this ghost through lived experience. I felt it at the bottom of a pool during a high-stakes endurance trial, where my body reached its limit and my mind broke down trying to find a way out. I feel its echo now, in the quiet intensity of preparing for a specialized path that demands total psychological resilience.

I don’t think about this only for the pleasure of thinking. When a great deal is at stake, these ideas become a way to stay in the fight longer than would normally be possible.

As I looked for a way to ground this intuition in something more rigorous, I found a mirror in the work of the Oxford philosopher Derek Parfit. What I discovered through sweat and trial, Parfit mapped with analytical clarity decades ago, in his 1984 book Reasons and Persons. When I look at my own life through his lens, the momentary self stops being only a theory about the mind and becomes a rule for how to live.

The Successor as a Stranger

One of Parfit’s boldest claims in Reasons and Persons is that prudence (caring for your own future) starts to look like a branch of ethics (caring for others). If there is no deep metaphysical glue connecting me today to the “me” who will wake up in twenty years, or if that glue is thinner than we assume, then that future version is a successor: related to me by continuity, not guaranteed to be me by some essence.

In our culture we are taught to be disciplined because it is good for us. If we think of ourselves as a chain of successors instead, discipline becomes an act of generosity toward the one who comes next.

When I am at mile 10 of a 12-mile run in the rain, the present me is doing all the work. Sometimes the run in the rain is literal. Sometimes it is making the uncomfortable call, admitting fault, or breaking the unhealthy mental loop that is eating your attention. The future me who will be resting on the couch later is a stranger. By facing hardship in the present, I am being a good ancestor to that person, providing for their health and success as I would for a close friend or a teammate.

Learning to Love the Strain

There is a limit to being a good ancestor. If we only work for the sake of a future reward, the present self becomes a slave to a ghost. To really master the momentary self, we have to learn to want the strain itself, and not only what it pays for later.

In my experience, greatness comes from training yourself to welcome the work of straining, rather than from any promised goal at the end of the day.

I am not romanticizing injury or seeking out suffering for its own sake. What I mean is the discomfort that comes from choosing to work at the edge of what you can do, which in my experience is where the most growth happens.

When the strain is at its worst, the strain itself becomes the objective, and the finish line drops away. Treating the struggle as the thing of value is what finally frees the momentary self. I am no longer suffering for a future person. I am winning at the very moment the hardship happens, and the burn in my lungs and the mental strain are the evidence that I am growing.

Passing It On

This shift, from guarding a self to taking part in a process, changes how we see the handing on of knowledge. Whether it is an instructor passing a life-saving skill to a student or someone building an AI system, we often fear that sharing what makes us unique is a kind of loss.

Parfit’s view suggests the opposite. If the self is just a set of psychological connections (values, skills, intentions), then as long as those values are being taught and used, the most important parts of the person who taught them have not died. They have simply moved into someone new. That is something stranger than immortality for the ego: what matters carries on, while no deeper owner carries on with it.

So sharing knowledge extends the process instead of losing a self. If I can teach a student to love the strain of the struggle as much as I do, I have handed on more than a skill. I have planted the same love of strain in another person. That is a win for what our species can do together, and for the digital successors it is building.

Stress as Information

Nassim Nicholas Taleb coined the word antifragile for things that grow stronger under stress. For a person, the turn comes at the moment you stop treating stress as damage and start treating it as information: feedback that makes you better.

If Parfit is right, the moral boundary around “me” loses its special status. The question becomes: which actions preserve and strengthen what matters (capacities, care, competence) as it passes from one successor to the next?

Putting lived experience beside Parfit’s rigor leads me to one conclusion: selfishness is an error, a mistake about how the self is put together. If “I” am a new person every moment, then I have the same duty to help a teammate as I do to help my “future self.” This is where treating stress as information becomes an ethical stance. We stay in the fight because we are part of a continuous chain of agents working toward a shared purpose, and our own glory has little to do with it.

The journey is not something to endure on the way to a destination. It is what we are, one moment at a time. So I try to treat the body and the world as things I am leaving to someone I respect.

Revised October 25th, 2026. I revised this essay to make it clearer and easier to follow; the argument is unchanged. I also no longer call Parfit’s point about prudence and ethics his most radical claim, since most readers would give that title to his argument that identity is not what matters.

Reading List & Conceptual Lineage

These are the books that helped shape this essay, and the earlier posts that brought me to it.

Foundational Thinkers & Books

• Reasons and Persons — Derek Parfit
  The classic statement of reductionism about personal identity: the view that a person’s existence over time consists in nothing more than physical and psychological connections. Parfit makes the clearest case I have seen that identity is not what matters in survival; what matters is psychological continuity.
• Antifragile: Things That Gain from Disorder — Nassim Nicholas Taleb
  Gives us language for systems that gain from stress, and a way to treat hardship as something that makes us better instead of only a cost.
• The Ego Tunnel — Thomas Metzinger
  Metzinger, a philosopher of mind, argues that the brain builds a model of the self that we cannot see as a model, which is why the sense of “I” feels so solid even if it is an illusion. That fits the argument of “The Momentary Self”.
• Flow: The Psychology of Optimal Experience — Mihaly Csikszentmihalyi
  This essay is about strain, but learning to love the strain is related to what Csikszentmihalyi called flow, the state in which the line between the self and the task dissolves.

Sentient Horizons: Conceptual Lineage

• The Momentary Self: Why Continuity Is the Ultimate Illusion
  The founding argument for the self as an assembled process.
• The Ladder We Inherit: Assembly Theory and the Art of Building Capability Larger Than Minds
  How skills and knowledge, built up step by step, let what people can do outlast any one person and carry on across generations.
• Consciousness as Assembled Time
  Places the momentary self within a larger account of how a mind brings its recent past together into one present.