This is considered as an authority in the world. Indeed, this is the eternal eye. One should be guided by this authority. This determines whether a king is to be called good or wicked.
एतत् प्रमाणं लोकस्य चक्षुरेतत् सनातनम्। तत् प्रमाणोऽवगाहेत तेन तत् साध्वसाधु वा॥