“I tell you not that with me are the treasures of Allah, nor do I know what is hidden, nor claim I to be an angel. Nor yet do I say, of those whom your eyes do despise that Allah will not grant them (all) that is good: Allah knoweth best what is in their souls: I should, if I did, indeed be a wrong-doer.”
So did (Allah) convey the inspiration to His Servant- (conveyed) what He (meant) to convey.
Lit., “whatever He revealed”: an allusion to the exceptional manifestation of the angel “in his true shape and nature” as well as to the contents of divine revelation as such. In its deeper sense the above phrase implies that even to His chosen prophets God does not entirely unveil the ultimate mysteries of existence, of life and death, of the purpose for which He has created the universe, or of the nature of the universe itself.
Asad, Muhammad (1980). The Message of the Quran. http://www.islamicweblibrary.com/wp-content/uploads/2020/04/55877864-54484011-Message-of-Quran-Muhammad-Asad-Islam-Translation.pdf