Ancient Hindu seers knew myth as mithya. They distinguished mithya from sat.
Mithyawas truth seen through a frame of reference. Sat was truth independent of any frame of reference.
Mithya gave a limited, distorted view of reality; sat a limitless, correct view of things. Mithya was delusion, open to correction. Sat was truth, absolute and perfect in every way. Being boundless and perfect, however, sat could not be reduced to a symbol or confined to a word. Words and symbols are essentially incomplete and flawed.
Sat therefore eluded communication. For communication one needs symbols and words, howsoever incomplete and flawed they may be. Through hundreds of thousands of incomplete and flawed symbols and words, it was possible to capture, or at least to indicate, the infinite perfection and boundlessness of sat.
For Rishis therefore the delusion of mithya served as an essential window to the truth of sat.