Okay it's time for everybody to get their little finger and bring it up to the corner of their mouth with their nail facing their mouth (The Dr. Evil gesture)... Infact it's actually Sign language for "Evil".
Anyway... The following is a whole bunch of quotes that I blatently Ripped from G**gle (<Not telling where!)
Have a read through them, I'm sure you'll find them of use to define an answer to this topic!
The evil that men do lives after them;The good is oft interred with their bones.
William Shakespeare
An insincere and evil friend is more to be feared than a wild beast; a wild beast may wound your body, but an evil friend will wound your mind.
Buddha
Work is a necessary evil to be avoided.
Mark Twain
Government is an unnecessary evil. Human beings, when accustomed to taking responsibility for their own behavior, can cooperate on a basis of mutual trust and helpfulness.
Fred Woodworth
When we forgive evil we do not excuse it, we do not tolerate it, we do not smother it. We look the evil full in the face, call it what it is, let its horror shock and stun and enrage us, and only then do we forgive it.
Lewis B. Smedes
Microsoft isn't evil, they just make really crappy operating systems.
Linus Torvalds
By swallowing evil words unsaid, no one has ever harmed his stomach.
Sir Winston Churchill
Do not have evil-doers for friends, do not have low people for friends: have virtuous people for friends, have for friends the best of men.
George Santayana
Non-cooperation with evil is as much a duty as is cooperation with good.
Mohandas Gandhi
The greatest evil is not done in those sordid dens of evil that Dickens loved to paint but is conceived and ordered (moved, seconded, carried, and minuted) in clear, carpeted, warmed, well-lighted offices, by quiet men with white collars and cut fingernails and smooth-shaven cheeks who do not need to raise their voices.
C. S. Lewis
Understanding does not cure evil, but it is a definite help, inasmuch as one can cope with a comprehensible darkness.
Carl Gustav Jung
The evil that is in the world almost always comes of ignorance, and good intentions may do as much harm as malevolence if they lack understanding.
Albert Camus
Men never do evil so completely and cheerfully as when they do it from religious conviction.
Blaise Pascal // *Cough,Cough,Tony1!*
Evil has no substance of its own, but is only the defect, excess, perversion, or corruption of that which has substance.
John Henry Newman
Evil exists to glorify the good. Evil is negative good. It is a relative term. Evil can be transmuted into good. What is evil to one at one time, becomes good at another time to somebody else.
Mencius
For evil to triumph, good men have to do nothing.
Edmund Burke
Violence isn't always evil. What's evil is the infatuation with violence.
Jim Morrison
Evil is not something superhuman, it's something less than human.
Agatha Christie
He who passively accepts evil is as much involved in it as he who helps to perpetrate it. He who accepts evil without protesting against it is really cooperating with it.
Martin Luther King, Jr.
False words are not only evil in themselves, but they infect the soul with evil.
Socrates
Be assured those will be thy worst enemies, not to whom thou hast done evil, but who have done evil to thee. And those will be thy best friends, not to whom thou hast done good, but who have done good to thee.
Tacitus
The world is a dangerous place. Not because of the people who are evil; but because of the people who don't do anything about it.
Albert Einstein
It is a man's own mind, not his enemy or foe, that lures him to evil ways.
Buddha
It's better to be good than evil, but one achieves goodness at a terrific cost.
Stephen King
For where the instrument of intelligence is added to brute power and evil will, mankind is powerless in its own defense.
Dante Alighieri
Keep what you have; the known evil is best.
Titus Maccius Plautus