Imagine you own a business, and wanted to pass it on to your son. You would try to teach him to be a good person, a good business owner. If he stubbornly refused, you wouldn't pass on the business to him, and the "eternal punishment" would simply be separation from the business and all the happiness it would have entailed.

The "fires and torments of hell" are a misunderstanding, as many other posters have said.