If people believe a deception to be truth  - then the truth won't affect them at all, in fact, they will believe the truth to be the deception.  Only by humbling themselves and submitting fully to the Holy Spirit can they become free of their deception.  Jesus said

"You shall know the Truth and the Truth shall make you free"

He did not say  "you shall learn the truth" or "you shall understand the truth", he said "know" as in "Adam knew his wife", as in "depart from me  - I never knew you" - for the Truth is a person  - the person who is Jesus the Christ.  Contained in Jesus  - The Truth  - is all the knowledge and wisdom we will ever need on this earth  - but knowledge does not, in and of itself, set us free, it is Jesus himself  who frees us, by His Spirit, for it is by his Spirit that we come to know Him.