Upadeśasāhasrī
Upadeśasāhasrī (Sanskrit: उपदेशसाहस्री, lit. 'A thousand teachings') is an 8th-century CE Sanskrit text of Adi Shankara. Considered a Prakaraṇa grantha, the Upadeśasāhasrī is considered among Shankara's most important non-commentarial works.