ज्ञानेन तु तदज्ञानं येषां नाशितमात्मनः। तेषामादित्यवज्ज्ञानं प्रकाशयति तत्परम् ॥

jñānena tu tad ajñānaṁ yeṣhāṁ nāśhitam ātmanaḥ teṣhām āditya-vaj jñānaṁ prakāśhayati tat param

Verily, in whom unwisdom is destroyed by the wisdom of the Self, in them wisdom, shining as the sun, reveals the Supreme.

In plain words: Krishna says that when ignorance is destroyed by knowing the true self, wisdom shines like the sun and shows the Supreme.