For in all such operations it manifestly subdues the irrational motions, both gnostic and appetitive, and absolves itself from them, as from things foreign to its nature.

Error may spring from either the cognitive or the appetitive faculty; in the first case, either from sense-perception, the imagination, or the pure understanding, and, in the latter, from the inclinations or the passions.

The former is relative to the cognitive, the latter to the appetitive faculty.