This short verse is an amazing revelation. Not only are lies dangerous, leading to spiritual and physical death, they prevent us from being able to believe the truth. They distort our view and poison our hearts, so that we cannot see the truth when it is right in front of us.
But not only do they distort our view, we cannot allow ourselves to let go of the lie. Like the first lie that was told to Eve, lies are empowered by our desires. A person who believes the lies of the devil are like drug addicts. They cannot let go of the lie because it promises ultimately to make them their own god.
A person who has accepted the lie is consumed by false hope. Even while they are slowly dying, they refuse to let go of the lie. They refuse to accept the truth.