Webster defines deceived as "when a person believes what is not truth to be truth...to be mislead."
How a Christian recognizes and responds to Satan’s tactics can determine their eternal destiny. We cannot close our eyes to the darkness and think we will not have to face it, confront it and bring the light of the Gospel into it.
While we are receptive to the wonderful workings of the Holy Spirit, we must also listen and be watchful in this hour. There are traps of offense, seduction, apathy, lustful attractions and distractions toward other things pulling at all Christians. If we are going to overcome to the end, we must guard our hearts from deception.
Wherefore let him that thinks he stands take heed lest he fall. (1Co 10:12)
This is a good book to examine yourselves to see if you are in the faith. The Word of God urges us to do this.
Examine yourselves, whether ye be in the faith; prove your own selves. Know ye not your own selves, how that Jesus Christ is in you, except ye be reprobates? (2Co 13:5)
It is good to keep a clean life. This book, as well as the Bible, is like 'Spring Cleaning' for the mind. Purity of heart and mind, are critical to walk with God!