how is the end of Doctor faustus justified?

Faustus has sold his soul. Yes, the end is justified. He sold his soul in order to quench his thirst for knowledge, but he never completely acquired the wisdom he sold it for. His thirst for knowledge could be considered impressive, but he is ultimately unable to understand certain truths. In the end, he has a brain loaded with factual information, and yet he gained a vital understanding of those facts far too late to make a difference.

In the end, his largest concern is still pleasure. He drinks, he eats, and he has women, but when given the chance to repent he refuses it......... even though the twenty years are almost over. He's brilliant and foolish all at the same time. When the clock strikes 11, he begs for mercy, but there's none to be had........... he's already had his chance and turns away from it. So yes, the end is justified. The end is Hell, he's torn to pieces and taken away........ that's what he bargained for.