In 1902, a professor asked his student whether it
  was God who created everythin that exists in the
  universe ?
Student replied: Yes
He again asked:
  what about evil ? Has God created evil also?
The
  student got silent.... Then the student requested
  that may he ask a question for him? 
  Professor
  allowed him to do so.
He asked: Does cold exist
  Professor said : yes ! Dont u feel the cold dear
Student said: I'm sorry but ur wrong sir. Cold is a
  complete absence of heat.. There is no cold, it is
  only an absence of heat.
Student asked again:
  Does darkness exist ? Professor said: yes !
Student
  replied: ur again wrong sir. There is no such thing
  like darkness. Its actually the absence of light.
Sir ! We always study light & heat, but not cold &
  darkness.
"Similarly, the evil does not exist.
  Actually it is the absence of love, faith & true
  belief in God."
  That student was swami Vivekananda...!!!.
