The self-evident Vedic scriptures are the highest evidence of all, but if these scriptures are interpreted, their self-evident nature is lost.
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.
To prove their philosophy, the members of the Impersonalist school have given up the real, easily understood meaning of the Vedic literature and introduced indirect meanings based on their imaginative powers.
Unfortunately, this kind of interpretation has covered almost the entire world. Therefore there is a great need to present the original, easily understood natural import of the Vedic literature. We have therefore begun by presenting Bhagavad-gītā As It Is, and we propose to present all the Vedic literature in terms of the direct meaning of its words.
Ref >> Srila Prabhupada Vani.