'Great householders and great theologians of olden times who knew this, have declared the same, saying, "No one can henceforth mention to us anything which we have not heard, perceived, or known." Out of these (three colours or forms) they knew all.

In plain words: Wise people of long ago, both family heads and religious scholars, knew this. They said nobody could tell them anything new, because by knowing these three basic parts they understood everything.