There are different formulations of the Principle of Sufficient Reason, but here is one:
PSR: For every positive truth, there is a sufficient reason why it is true.
Here is a worry for PSR.
Call the Superfact the fact which is composed of every true fact. It’s really big.
But, is there a sufficient reason for why the Superfact is true? And if there is, what is it?
The Superfact is a contingent fact since at least one of its conjuncts is contingent, so it seems strange to say that the Superfact is it’s own sufficient reason why it is true — that only seems to work for necessary truths. But there is also no fact outside of the Superfact to work as the reason either.
So, is there a Superfact? Does it show that PSR is false? Is there a close cousin of PSR which avoids the Superfact problem?