"Bhikkhus, the round is beginningless. Of the beings that travel and trudge through this round, shut in as they are by ignorance and fettered by craving, no first beginning is describable." SN 15:1
"That both I and you have to travel and trudge through this long round is owing to our not discovering, not penetrating, four truths. What four? They are: (I) the noble truth of suffering, (II) the noble truth of the origin of suffering, (III) the noble truth of the cessation of suffering, and (IV) the noble truth of the way leading to the cessation of suffering." DN 16
Now, I suppose these are mundane dhamma, but if so, why?