The irony lies in the fact that even not wanting to be condemned and having been warned of the condemnation by Mephistophilis, Faustus keeps the pact.
Mephistophilis' words compare Lucifer to Faustus, as he points out that both were very proud, ambitious, and insolent, being capable of anything to achieve their desires. These traits have led to Lucifer's doom and will lead to Faustus as well.
Faustus doesn't want to be condemned but still keeps the pact with Mephistophilis, knowing the consequences.
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