Universe in Hindu Philosophy

"There was neither existence and nor non-existence; There was neither space nor air;"Hindu philosophy had testing system to assess their doctrines and even their metaphysics and ethics were tested well before pronouncing in the mass. the confusion arose when we mixed philosophy with mythologies. Indian philosophies and Upnishads is a one part and then mythologies and Puranas is another part of Hindu concepts and interestingly both the parts are drive from Vedas. And it was a chance that mythologies and Purnanas prevailed over philosophy and Upnishads making Hindu thoughts purely a showcase of spiritualism. The first question which every Indian system of philosophy has settled is how we come to know a certain things. Three channels by which knowledge can reached, perception, inference and authorities. But the other part of Puranas and mythologies took authorities as the only source of knowledge.