Deception is half truth  
                    half lie.

often convincing

but
questions the truth.

and has a lie embedded in the truth.

the great deceiver

sometimes the battle is not man to man

but demons telling lies

the devil deceived Eve who deceived Adam
then both were banished from the Garden of Eden.

Jesus Himself spoke words of truth from the scriptures
when tempted by the devil.

a warning

"They exchanged the truth of God for a lie"
Romans Chapter 1 verse 25

Truth is not always convenient
Is often costly
but it's worth paying the price.