His motives for volunteering lie somewhere on the 'continuum' between charitable and self-serving.
a 'continuum' of temperatures ranging from very cold to very hot
(..) They, really, should put the warnings before the spells. Your curiosity could have gotten you killed. You weren't manipulating the space-time continuum, you were breaking it. We do not tamper with natural law! We defend it. How did you know to do that? - Hm? Where did you learn the litany of spells (..)2016 Doctor Strange
(..) What if...? Dormammu. The Dark Dimension. Eternal life. STOP! Tampering with continuum probabilities is forbidden! I-I was just doing, exactly what it said in the book! What did the book say about the dangers of performing that ritual? (..)2016 Doctor Strange