Luqman closes with a list classical theology calls the 'five keys of the unseen': knowledge of the coming Hour, when rain will fall, what is in the wombs, what any soul will earn tomorrow, and in what land a person will die (31:34), each introduced by the declaration that God alone possesses this knowledge. The list became a standard reference point in Islamic theological writing on the limits of human and even angelic or prophetic knowledge, cited to argue that claims to foreknowledge in these specific domains, however framed, fall outside what revelation grants any created being.
Commentators note the list is not exhaustive of all unseen knowledge reserved to God but singles out these five as particularly emblematic, matters people commonly wish to foresee, weather, fertility, fortune, the timing and place of death, precisely because the desire to know them is so ordinary and persistent. The verse is frequently cited in later Islamic critique of astrology, fortune-telling and similar practices claiming to predict these same categories of outcome, treated by classical jurists as trespassing on knowledge the Quran here explicitly reserves to God alone, distinct from legitimate observation-based forecasting such as weather prediction from natural signs.