Session 4 · Telling a cause from a coincidence

Cause and Effect

因果 — and the first real payoff of "same entity, different name"

Before class: Session 2 (One and Many) — today reuses that idea directly.

Part 1

The Puzzle

A rooster crows every morning, seconds before the sun clears the horizon. It has done this every single day of its life, without fail. By the standard of "reliably comes right before," the rooster has a flawless track record.

Did the rooster's crow cause the sunrise?

Obviously not — and you know this without needing a monastery. But notice why you know it: not because the timing is wrong (the timing is perfect), but because the rooster has no actual power to move the sun. Reliable sequence and real causal power are two different things, and mixing them up is one of the most common reasoning errors humans make — in weather lore, in medicine, in your group chat's Sunday hot takes.

Same toggle as before — every debate line below has both versions.

Part 2

The New IdeaWhat a real cause has to do, that mere timing doesn't

Quick recap:

"So…""It follows that…" "That's not true.""The reason is not established." "That doesn't prove it.""There is no pervasion." "Yes, I agree.""I accept it."

A genuine cause因 (rgyu) has to clear two bars, not one:

Comes firstTemporal priority

The cause exists before the effect appears.Necessary, but nowhere near enough on its own

Has the powerProducing capacity

The cause actually has the ability to bring the effect about.This is the bar the rooster fails

Now for the payoff. Every effect果 (bras bu) — anything actually produced by causes — turns out to share an exact membership list with something you'd never have guessed was the same group: everything impermanent. A clay pot is a product (clay + water + a potter's hands + fire) and it's also impermanent (it will eventually crack and crumble). Push on it from either side and you get the same set of things.

This is Session 2's "same entity, different name" — cashed in for real. "Product""Product" (byas pa) and "impermanent thing""impermanent thing" (mi rtag pa) are one entity, reached by two completely different roads: one road asks where did this come from, the other asks is this changing moment to moment. Same destination.

Part 3

Worked ExampleTiming vs. power, tested directly

Challenger

"So, the rooster's crow caused the sunrise, because the sunrise always follows the crow." "It follows that the crow is the cause of the sunrise, because the sunrise invariably follows it."

A perfect, unbroken record of coming first — and nothing else.

Defender

"That doesn't prove it!" "There is no pervasion."

Reliable sequence is true — but coming first, by itself, was never the whole test. The rooster has no power over the sun.

Challenger

"So, this pot is a product, because it is impermanent." "It follows that the pot is a product, because it is impermanent."

Two labels, tested against each other directly.

Defender

"Yes, I agree." "I accept it."

Product and impermanent thing are one entity — whatever is one is automatically the other, no exceptions.

The habit this session builds

"Always comes before" is not the same as "makes it happen." The rooster passes the first test and fails the second — and the second test is the one that actually matters.
"Product" and "impermanent" are the same club, entered from different doors. Once you've proven something is one, you've automatically proven it's the other.

Part 4

PracticeSame three-move check as always

1. "So, ice cream sales cause drowning deaths, because both go up in summer."

"That doesn't prove it!""There is no pervasion." — both really do rise together, but neither causes the other. Hot weather causes both: more swimming, more ice cream.

2. "So, my headache was caused by yesterday's thunder, because the thunder happened first."

"That doesn't prove it!""There is no pervasion." — coming first is true, but thunder has no established power to cause headaches. Priority without power, exactly like the rooster.

3. "So, this flower is a product, because it grew from a seed, water, and sunlight."

"Yes, I agree.""I accept it." — genuine causes (seed, water, sunlight) that actually have the power to produce a flower, and did.

Looking ahead

Session 5 — What It Means to Deny Something

"There's no elephant in this room" and "he's not rich" are both negative sentences — but they don't do the same job. One just clears space; the other quietly implies something specific is true instead. Session 5 gives that difference a name.

← Course overview Session 5 →