question #1 Sahih al-Bukhari 6618, Book 82, Hadith 24 : What does this narration suggest about the limits of human knowledge and power in relation to divine decree?

The Prophet (ﷺ) said to Ibn Saiyad, “I have kept for you a secret.” Ibn Saiyad said, “Ad-Dukh.” The
Prophet said, “Keep quiet, for you cannot go beyond your limits (or you cannot exceed what has been
foreordained for you).” On that, `Umar said (to the Prophet (ﷺ) ), “Allow me to chop off his neck!” The
Prophet said, “Leave him, for if he is he (i.e., Ad-Dajjal), then you will not be able to overcome him,
and if he is not, then you gain no good by killing him.”