We quote Vedic evidence to support our statements, but if we interpret it according to our own judgment, the authority of the Vedic literature is rendered imperfect or useless. In other words, by interpreting the Vedic version one minimizes the value of Vedic evidence. When one quotes from Vedic literature, it is understood that the quotations are authoritative. How can one bring the authority under his own control? That is a case of principiis obsta.