How are power and persecution related to one another?

People with power persecute without thinking 

if you have power most often you are also persecuting someone

(Take this with a grain of salt please.) According to the dictionary, Persecution is being hostile and ill-treating someone because of a different race, religion or political stance. NOW with that in mind, a common way people gain power over one another is fear. Fear drives people into submission(Esp when the source of fear is the majority.) People submitting to you equals power in most cases. (Wrongly I might add.) Again, not sure if this is the answer you're looking for, but I tried my best haha. 

He could achieve one important goal and then stop for the day

The answer might be a hope