13.34

यथा प्रकाशयत्येकः कृत्स्नं लोकमिमं रविः ।
क्षेत्रं क्षेत्री तथा कृत्स्नं प्रकाशयति भारत ॥

yathā prakāśayaty ekaḥ kṛtsnaṃ lokam imaṃ raviḥ
kṣetraṃ kṣetrī tathā kṛtsnaṃ prakāśayati bhārata

Kṛṣṇa (कृष्ण) is still speaking, to Arjuna (अर्जुन).

The verse

Just as one sun illumines this entire world, so the knower of the field illumines the entire field, descendant of Bharata (भरत).

नेपालीमा

जसरी एउटै सूर्यले यो सारा संसार उज्यालो पार्छ, त्यसरी क्षेत्रज्ञले सारा क्षेत्र उज्यालो पार्छ, हे भरतवंशी।

Where it sits

The sky in 13.33 was the picture of not being stained, and the one sun is the picture of lighting, with kṣetrī (क्षेत्री), the knower of 13.2, set beside the whole field.

Split: यथा + प्रकाशयति + एकः + कृत्स्नम् + लोकम् + इमम् + रविः + क्षेत्रम् + क्षेत्री + तथा + कृत्स्नम् + प्रकाशयति + भारत

yathā + prakāśayati + ekaḥ + kṛtsnam + lokam + imam + raviḥ + kṣetram + kṣetrī + tathā + kṛtsnam + prakāśayati + bhārata

Sanskrit, in depth

The words

देवनागरीWordGrammarSense
यथाyathāindeclinablejust as.
प्रकाशयतिprakāśayatipresent, 3rd singular, causative of prakāś (प्रकाश्)it illumines.
एकःekaḥnominative singularone.
कृत्स्नम्kṛtsnamaccusative singular masculineentire. Agrees with lokam (लोकम्).
लोकम्lokamaccusative singularthe world.
इमम्imamaccusative singular masculinethis. Agrees with lokam (लोकम्).
रविःraviḥnominative singularthe sun.
क्षेत्रम्kṣetramaccusative singularthe field.
क्षेत्रीkṣetrīnominative singular of kṣetrin (क्षेत्रिन्)the one who has the field. The knower of 13.2.
तथाtathāindeclinableso.
कृत्स्नम्kṛtsnamaccusative singular neuterentire. Agrees with kṣetram (क्षेत्रम्).
प्रकाशयतिprakāśayatipresent, 3rd singular, causativeillumines.
भारतbhāratavocativedescendant of Bharata (भरत).

The phrases

यथा प्रकाशयति एकः कृत्स्नं लोकम् इमम् रविः yathā prakāśayati ekaḥ kṛtsnaṃ lokam imam raviḥ is the picture. Just as one sun illumines this entire world. प्रकाशयति + एकः prakāśayati + ekaḥ is prakāśayaty ekaḥ (प्रकाशयत्येकः). लोकम् + इमम् lokam + imam is lokam imam (लोकमिमम्).

kṣetraṃ kṣetrī tathā kṛtsnaṃ prakāśayati bhārata (क्षेत्रं क्षेत्री तथा कृत्स्नं प्रकाशयति भारत) is the match. So the knower of the field illumines the entire field, descendant of Bharata (भरत). One sun, one kṣetrī (क्षेत्री). The field is the object, as the world was the object.

Sanskrit in this line

प्रकाशयति + एकः prakāśayati + ekaḥ is prakāśayaty ekaḥ (प्रकाशयत्येकः). i (इ) before a different vowel becomes y (य्).

kṣetrī (क्षेत्री) is the nominative singular of kṣetrin (क्षेत्रिन्). The suffix --in (इन्) means "one who has" the noun it sits on. kṣetra (क्षेत्र) is the field. kṣetrī (क्षेत्री) is the one to whom the field belongs. The nominative of an --in (इन्) stem is --ī (ई), with no visarga.

Say it back

Match the sun to kṣetrī (क्षेत्री). If kṣetrī (क्षेत्री) comes out as the field, stay here. The field is what gets lit.