तं दुर्दर्शं गूढमनुप्रविष्टं गुहाहितं गह्वरेष्ठं पुराणम् । अध्यात्मयोगाधिगमेन देवं मत्वा धीरो हर्षशोकौ जहाति ॥ १२॥

ॐ

English Translation

The wise man who, by means of concentration on the Self, realises that ancient, effulgent One, who is hard to be seen, unmanifest, hidden and who dwells in the buddhi and rests in the body-he, indeed, leaves joy and sorrow far behind. 
 

ॐ

English Commentary

The âtman which you wish to know is hard to see, being extremely subtle, lodged in the inmost recess, being concealed by the modifications of consciousness, caused by worldly objects. Located in intelligence (being realised, as if there lodged) and seated amidst manifold miseries. Being lodged in the inmost recess and located in intelligence, he is seated amidst miseries; (being thus seated he is hard to see) dwelling on that ancient âtman, with a mind weaned from all external objects and concentrated on the âtman, the intelligent man renounces joy and grief, as there is neither superiority nor inferiority for the âtman.

shri Shankaracharya