There are three levels to the contents of the human intellect.
The lowest has to do with factual knowledge, the
middle with reason, and the highest with understanding.
These levels are so clearly distinguished from each
other that they never blur. The Lord exerts an influence
on our rational thinking through the things we truly understand,
and on the data in our memory through our
rational thinking, giving life to the senses of sight and
hearing. This is true influx; this is the true connection between
the soul and the body.
—Secrets of Heaven 657