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.