The works of Ādi Śaṅkarācārya

Sanatsujātīyam

p. 256

p. 256

सत्यात्मा भव राजेन्द्र सत्ये लोकाः प्रतिष्ठिताः ।

In plain words

Let truth be what you are made of, king among kings. The worlds themselves rest on truth.

Close to the Sanskrit

Be one whose self is truth, O foremost of kings; in truth the worlds are established.