If we regard sensations
as immaterial things which are totally different from all material, physiological processes, it would be difficult to imagine from where these psychic phenomena should have come.
But a power that could produce and deal with
an immaterial thing like a concept must itself be immaterial according to the axiom «to act follows to be» (agere sequitur esse).
What we call the five senses only make us perceive sounds, colors, smell, tastes and the like, but it is the spirit which makes them distinguish the principles, reason and
all immaterial things».
Find out
the immaterial things that you need to eliminate.
The Oxford English Dictionary defines the verb use as «to make use of (
some immaterial thing) as a means or instrument; to employ for a certain end or purpose.»