I think, people who commit to evil and also commit to Good are the ones who stay the most miserable in this life. If they consistently commit to evil, they will not be miserable.   
             Because indeed, isn't " the life of this world only a deceiving enjoyment"? 

GOOD over Evil.

                If they consistently commit to good, they will too not be miserable.
                But, the world now does consist of more evil than good, doesn't it? 
As Mohammad(s.a.w) would say, "The world is a prison-house for a believer and Paradise for a non-believer".  
                Indeed, the believer should consistently commit to Good and not partner Good with Evil, because that is where the believer most suffers. - #Truth