What's the Difference Between Good and Evil?

The line dividing good and evil cuts through the heart of every human being. Sometimes it is squeezed one way by exuberant evil, and sometimes it shifts to allow enough space for good to flourish. At times, he is close to bein a devil at times to sainthood, but his name doesn't change. He goes on to talk about ideology. So what's the difference between someone who you don't like, a shakespearian character, does a hand full of murders and then can do no more? From good to evil is one quaver says proverb. And correspondingly, from evil to good.