Very sobering! There should be more sermons today on the topic of hell, it might give people pause to reflect on how they are living their lives.
The last remark about hell being a mercy of God for those who hate Him is very interesting - and I love the example he uses to illustrate this point.
I used to imagine that perhaps Heaven was filled with a brilliant and intense light that was excruciatingly painful for those souls who died in the darkness of sin (like the hypersensitivity to light that one experiences when suffering a migraine headache - or from walking outside into the noonday sun after spending all day in a pitch black room), so that hell was to some extent a relief from an unbearable torment to a bearable one.
I am only speculating of course.