“The great knowledge located in the body is devoid of all conceptuality.” 

The Hevajra Tantra (c. 900CE-), The Hevajra Tantra became the first major Buddhist Tantra to be translated in its entirety into a Western language when David Snellgrove published his The Hevajra Tantra: A Critical Study in 1959. This work is in two volumes, the first volume containing his introduction including an "apology" explaining why such a text is worthy of study (apparently because of the unsavory reputation the tantras had acquired in the West early in the 20th century).