When you conflict with someone, and you decide to be the bigger person and walk away, sometimes they'll still try causing trouble for you long after.
In the most literal way - Enough Heat = Pain + Burn
This question deserves about a 5 page response, but I don't have the time.
But here's two quotes from an article, and a link to that article, that gives a decent answer to your question:
Why did God make the earth and us along with it? He doesn't really need us, so why did he create anything?
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Well you could look at it this way we are have a brain, a heart, and courage all things the scarecrow, Tin man and Lion didn't have, they were given a degree, a clock and a medal. Maybe we're meant to work it out, let's hope we are not in the land of Oz :)