I. Wherein is the Criterion for the Apprehension of the Soul.

All things that exist are either known by sense⁴⁴²⁴⁴²    αἰσθήσει. or apprehended by thought.⁴⁴³⁴⁴³    νοήσει. And what falls under sense has its adequate demonstration in sense itself; for at once, with the application, it creates in us the impression⁴⁴⁴⁴⁴⁴    φαντασίαν. of what underlies it. But what is apprehended by thought is known not by itself, but by its operations.⁴⁴⁵⁴⁴⁵    ἐνεργειῶν. The soul, consequently, being unknown by itself, shall be known property by its effects.