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Obviously, the short answer is because Jesus said so. Unfortunately this may not be a particularly compelling answer for someone who does not see the Bible or Jesus as an authoritative source. Authority is a fairly significant issue and is beyond the scope of what I want to cover here, but will certainly attempt to address that at another time.
For now, assuming that the Bible is actually authoritative, let's take a look at how this remains a very important doctrine from within the Christian faith. For many, the fact that Jesus said so is sufficient. But how and why is that the case?