Where did the vedas originate

Knots of poetry makes the vedas. These verses are not composed by man, they are meant to precede man. Who composed them? Maybe the seers saw them first, the seven sages in the sky, saw the Vedas word by word, waxing and waning, disappearing and flashing in that inward eye that was as open in them as was the outward. All their concentration was on heating the mind till it got illumination, maybe the first words of the vedas flashed across the cinema screen of their minds? But the vedas are sruti. So were they heard first, directly revealed as sound? Not to be broken down, and understood, but to be passed on, preserved, sung into the world from time to time by the priestly class alone. Like the perfect image that can only be seen, not understood,that stays unchanged, but changes the one who sees. Does that beginning already make all questions redundant? Or can one still ask why three of the four Vedas are to do with sacrifice? Or why the early Aryans left of themselves, not remains of palaces and temples and city streets as memoir, but only these verses, each word in its place, repeated, unchanging from mouth to mouth, for ever more.