I like the twist on words, but if I look at it correctly, when you say "nothing" it should be given 2 meanings.
It's suggesting a case of Equivocation.
"What is better than eternal bliss? Nothing. But a slice of bread is better than nothing. So slice of bread is more than eternal bliss."
The first "Nothing" is saying that there is No Thing better than eternal bliss - thus that eternal bliss is the best Thing to have.
The second "Nothing" is saying that it is better to have bread than No thing at all - thus that bread is better than not having anything at all (zilch, nada, not-a-thing.)
The concluion therefore, is equivocating two very different uses of the word "Nothing" in the previous phrase.