There is some good in the worst of us and some evil in the best of us. Martin Luther King, Jr.

There is some good in the worst of us and some evil in the best of us. When we discover this, we are less prone to hate our enemies. - Martin Luther King, Jr. 

  Never succumb to the temptation of bitterness. - Martin Luther King, Jr. 

Further reading: Dr. Martin Luther King Jr: Hatred paralyzes life; love releases it. Hatred confuses life; love harmonizes it. Hatred darkens life; love illumines it.