Finally the four words! (spoiler)

[kusje]

In my opinion, the phrasing of the prophecy said he would say four words, then he would get ultimate power.

As B is trying to say, it is largely an issue of semantics. The oracle didn't say "he would say four words, then he would get ultimate power". The oracle said he would get ultimate arcane power BY saying the right blah blah blah when V asked him HOW he would get the power.

how1   [hou] Show IPA
–adverb
1. in what way or manner; by what means?: How did the accident happen?


by1   [bahy] Show IPA preposition, adverb, adjective, noun, plural byes.
13. in consequence, as a result, or on the basis of: We met by chance. We won the game by forfeit.

"I... I must succeed" could well be the four words but only through poor writing and phrasing on the author's part. Also, there is no need to be rude just because we don't agree. Asking if we are also part of the "belkar is neutral" club is just asking for a fight.