Just as the one Sun illumines the whole world, so also the Lord-of-the-Field (PARAMATMAN) illumines the whole Field O Bharata.

yathā = as; prakāśayati = illuminates; ekaḥ = one; kṛtsnaṃ = the whole; lokaṃ = universe; imaṃ = this; raviḥ = sun; kṣetraṃ = this body; kṣetrī = the soul; tathā = similarly; kṛtsnaṃ = all; prakāśayati = illuminates; bhārata = O son of Bharata.;