The works of Ādi Śaṅkarācārya

Viṣṇusahasranāmastotram

Verse 128

यद्यद्वैतं प्रपञ्चस्य तन्निवर्त्य हि चेतसा ।मनोवृत्तिमयं द्वैतमद्वैतं परमार्थतः ॥

In plain words

Whatever duality this spread-out world throws up, whichever one it is — dissolve it with the very mind that raised it. Duality is made of nothing but the mind's own movement. In truth, there is only advaita, the one without a second.

Close to the Sanskrit

Whatever duality there is of the manifold world, that indeed is to be turned back by the mind; duality is made of the mind's movement — non-duality is what is so in the highest sense.