The combining of Paul’s writing to the Romans and Hebrews produces this:
The righteous shall live by the assurance of things hoped for, the conviction of things not seen.
So then, this can only mean that the unrighteous do not live by faith, they do not live their lives by the assurance of things hoped for nor the conviction of things not seen. They live their lives by things hoped for but without assurance or conviction of the actual existence of that which they hope for – this is indeed a hopeless and unrighteous existence.
And since Paul begins with this: “The wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth.” we can conclude that unrighteousness is ungodliness and that the unrighteous deceive themselves which follows since they are ungodly and therefore children of Satan.