The works of Ādi Śaṅkarācārya

Viṣṇusahasranāmastotram

Verse 608

एको विष्णुर्महद्भूतं पृथग्भूतान्यनेकशः ।

In plain words

Viṣṇu is one — one vast Being. And the beings stand apart from each other, many, countless in number and kind.

Close to the Sanskrit

One is Viṣṇu, the great Being; the beings, standing separately, are manifold.