The works of Ādi Śaṅkarācārya

Sanatsujātīyam

p. 212

p. 212

द्रष्टव्यमात्मनस्तस्मादभेदेन विचक्षणैः ॥

In plain words

So those who can see clearly must see it this way: not one thing apart from the Self — no difference at all.

Close to the Sanskrit

Therefore it is to be seen, by the discerning, as non-different from the Self.