The works of Ādi Śaṅkarācārya

Sanatsujātīyam

p. 260

p. 260

ततः कर्म प्रतायेत सत्यस्यानवधारणात् ॥ ३९ ॥

In plain words

From failing to ascertain the real, worldly action multiplies without end.

Close to the Sanskrit

Thence action is spread out, from the non-ascertainment of the real.