The goal of the father-of-lies is to fill us with a system of beliefs, so that we would fill our Selves with another system of beliefs that would correct the first system of beliefs.
Maintain an Awareness
We need to make sure that we expect Truth from the Spirit of Truth, who goes out from the Perfect Father, and not try to come up with our own counterfeit truth by logically trying to reason things out for ourselves.
The Two Counsels