If evil didn't exist than how can we define good?

I asked a similar question the other day and people on YA didn't seem to get what I was getting at. I mean cold is the absence of heat. But what if in an alternate reality cold didn't exist at all for the sake of argument. Then how could we or at least re-defined heat? That's my point with evil and... show more I asked a similar question the other day and people on YA didn't seem to get what I was getting at. I mean cold is the absence of heat. But what if in an alternate reality cold didn't exist at all for the sake of argument. Then how could we or at least re-defined heat? That's my point with evil and good. How can one exist without the other?
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