Who said anything about "timeless wisdom"? There are many Muslims that acknowledge that what is taught in the Quran is some timeless stuff, and some stuff good for the time of revelation only, and some stuff that might be good for today but requires refinement.
The true teachings of Prophet Muhammad are to be found in the Quran only.
The Hadiths are all unreliable in my opinion, and the Quran warns about the fabrications found within them, likely overseen by Uthman.
