Manava Dharmashastra 4.242

4.242

upasaṃhāro'yam | dustaraṃ tamaḥ kṛcchreṇa yattīryate | tamo duḥkham | tadapi dharmeṇa sahāyena sutaraṃ bhavati | na hi tādṛśe tamasi majjatītyarthaḥ |

Medhātithi’s commentary (manubhāṣya):
This is a recapitulation.

‘Unfordable darkness’—i.e., that which is crossed over with difficulty.

‘Darkness’ stands for suffering. Even such ‘unfordable darkness’ becomes easily fordable with the aid of Merit as a companion; i.e., the man does not become submerged in the darkness.—(242)