The works of Ādi Śaṅkarācārya

Viṣṇusahasranāmastotram

Verse 237

आलोड्य सर्वशास्त्राणि विचार्य च पुनः पुनः ।इदमेकं सुनिष्पन्नं ध्येयो नारायणः सदा ॥

In plain words

Churn every scripture there is. Think it through again, and again. One thing settles out clean: meditate on Nārāyaṇa, always.

Close to the Sanskrit

Having churned all the scriptures, and having deliberated again and again, this one thing is thoroughly settled: Nārāyaṇa is always to be meditated upon.