The wisdom of revelation is to complete human access to guidance, especially the details of unseen realities and religious law beyond unaided reason. Its possibility accords with divine power and wisdom; claims that revelation is impossible require an independent argument.
Proof of a prophetic mission involves distinguishable elements: reliable transmission of the claim, a validating miracle, the strength of historical evidence and the claimant's character.
Adam as first prophet and Muhammad ﷺ as final prophet define the beginning and completion of this succession. Distinguishing miracles from saintly favors and magic keeps prophetic verification separate from unrelated wonders.