Status Updates From Posterior Analytics (Claren...

The things we seek are equal in number to those we understand. We seek
four things: the fact, the reason why, if it is, what it is.

familiar of the converting terms. For nothing prevents the nonexplanatory one of the counterpredicated terms from sometimes being more familiar, so that the demonstration will occur through this.

Understanding the fact and the reason why differ, first in the same
science—and in that in two ways: in one way, if the deduction does not come about through immediates (for the primitive explanation is not assumed, but understanding of the reason why occurs in virtue of the primitive explanation); in another, if it is through immediates but not through the explanation but through the more