"...What word is this, for with authority and power he commandeth the unclean spirits, and they go out?" (Luke 4: 36).
The words of these verse clearly illustrates how Jesus has control even the evil sides of human beings. He promised we too can do the same even with a minute amount of faith. But when we see believers giving in to temptations of the world we would always say "to err is human".
Mediocrity is such a wretched virtue if a person accepts and have trust on Jesus. We heard the promise and we have seen the example. What needs to be done is hone it and have control. Just as Jesus can drive the devil out, we too can say no to temptations of the world.
"People who are unable to motivate themselves must be content with mediocrity, no matter how impressive their other talents." Andrew Carnegie