Brahma Sutras
ॐ स्वामिनः श्रुतेरित्यात्रेयः ॐ ॥ ३-४-४४॥
The teacher Atreya thinks that the agentship for meditation belongs to the master of the sacrifice, since the Upanishads mention their results.
english translation
OM svAminaH zruterityAtreyaH OM ॥ 3-4-44॥
hk transliteration by Sanscript