Sin's hidden deception
Author Steve Gallagher describes sin's hidden deception:
People are prone to overlook their deeply embedded sin because it has an extremely deceptive nature. There exists an interesting correlation between a person's involvement with sin and his awareness of it. The more a person becomes involved in sin, the less he sees it. Sin is a hideous disease that destroys a person's ability to comprehend its existence. It could be compared to a computer virus that has the ability to hide its presence from the user while it systematically destroys the hard drive. Typically, those who are the most entangled in sin are the very ones who cannot see its presence at work inside them. Sin has the ability to mask itself so well that it can actually make a person who deals with it the least, think he is the most spiritual.
No wonder Paul warned that we should not be deceived by the "deceitfulness of sin"! Gallagher says the person who refuses to deal with his sin often thinks he is the most spiritual!
Erwin W. Lutzer, When You’ve Been Wronged: Moving from Bitterness to Forgiveness (Chicago, IL: Moody Publishers, 2007).