You use your mouth for evilLying is normally the second stage booster to a sinful lifestyle.
and harness your tongue to deceit.
A person starts off with some sinful action. Possibly like the last verse, they have thrown in their lot with thieves or adulterers. There is hope yet to not be carried away in this lifestyle, but when the actions begin to be covered up with lies, things begin to decline quickly. Lying nearly always proliferates the life of someone who is wrapped up in a sinful lifestyle.