Western scholars have traditionally considered the earliest sūtra in the Prajñāpāramitā class to be the "Aṣṭasāhasrikā Prajñāpāramitā Sūtra" or "Perfection of Wisdom in 8,000 Lines", which was probably put in writing in the 1st century BCE. This chronology is based on the views of Edward Conze, who largely considered dates of translation into other languages. This text also has a corresponding version in verse format, called the "", which some believe to be slightly older because it is not written in standard literary Sanskrit. However, these findings rely on late-dating Indian texts, in which verses and mantras are often kept in more archaic forms.