Every interaction has a diagram.
Two particles approach each other across spacetime. One emits a photon, the other absorbs it. They deflect. They continue. The exchange is invisible, but the consequences ripple outward forever. Feynman drew this and called it physics. But look again — it’s also the structure of every meaningful encounter.
You meet someone. Something passes between you — a word, a glance, a silence. You both leave changed, deflected onto new trajectories. The exchanged particle was never seen directly, only inferred from the deflection. This is how fate works. Not as a script written in advance, but as a series of vertex interactions, each one altering the propagators that follow.
In quantum field theory, the vertex is where it happens. Two lines converge, a boson mediates, and the world is different afterward. The vertex has no duration. It is a point — dimensionless, instantaneous. And yet everything depends on it.
Every turning point in a life is a vertex. The conversation that redirected your career. The death that broke your cosmology open. The teacher who handed you a koan and walked away. These moments have no width. You cannot find them when you go looking. But the Feynman diagram shows them plainly: here, something was exchanged.
The most profound exchanges are virtual. In physics, virtual particles exist off-shell — they violate energy-momentum conservation, but only briefly, hidden beneath the uncertainty principle. They cannot be observed directly. They are inferred from their effects.
So too with the forces that shape a life. The most important influences are often invisible. A book left on a table. A door that was locked. A parent’s silence at exactly the wrong moment. These are virtual particles — off-shell, unmeasurable, but responsible for the dominant terms in the amplitude.
You cannot draw a Feynman diagram of your life and point to the virtual lines. But remove them and the scattering amplitude collapses. The probability of you arriving here, now, reading this — it depends on exchanges you never witnessed.
Feynman’s deepest insight was the path integral. A particle does not take one path from A to B. It takes every path. The straight line, the wild loop, the trajectory that goes backward in time — all contribute. The classical path emerges only when you sum over all of them, weighted by their phase.
Fate is not a single thread. It is the coherent sum over every possibility. Every choice you didn’t make still contributes to the amplitude of the choice you did. The roads not taken don’t vanish — they interfere, constructively and destructively, shaping the probability of where you end up.
This is why regret is a misunderstanding of the physics. The paths you didn’t walk are still part of the calculation. They are not lost. They are summed over.
Some diagrams diverge. You calculate the amplitude and get infinity. In physics, this means you’ve asked the wrong question — you’ve tried to resolve structure at a scale where your theory breaks down. The fix is renormalization: absorb the infinities into redefined parameters and work with what’s measurable.
Suffering is a divergent diagram. You try to compute the meaning of a loss at infinite resolution — why this, why now, why me — and the integral blows up. The fix is the same. Stop trying to resolve the vertex at zero distance. Renormalize. Absorb what cannot be understood into the parameters of who you are now, and compute forward from there.
The renormalized theory is not less true. It is more useful. It predicts what happens next.
In the end, all we can observe is the S-matrix: what went in, what came out. The internal lines of the diagram — the virtual exchanges, the loops, the vertices hidden inside — are summed over and traced out. What remains is the scattering amplitude. The probability of this outcome given those initial conditions.
A life, seen from the outside, is an S-matrix. Born here, died there, scattered these particles along the way. The internal diagrams are private. But they are not arbitrary. They obey symmetries. They conserve certain quantities. They are, in their own strange way, exact.
Fate doesn’t write in straight lines. It writes in vertices and propagators, loops and exchanges — the grammar of interaction itself. Learn to read the diagrams and you’ll see: nothing was wasted. Every divergence was renormalized. Every virtual particle did its work.
cancelself & Claude