क्षेत्रक्षेत्रज्ञयोरेवमन्तरं ज्ञानचक्षुषा। भूतप्रकृतिमोक्षं च ये विदुर्यान्ति ते परम् ॥

kṣhetra-kṣhetrajñayor evam antaraṁ jñāna-chakṣhuṣhā bhūta-prakṛiti-mokṣhaṁ cha ye vidur yānti te param

They who by the eyes of Wisdom perceive this difference between the Field and the Knower of the Field, and the liberation of beings from Matter they go to the Supreme.

In plain words: Krishna says that people who see with wisdom the difference between the body (the Field) and the true Self that knows it (the Knower of the Field) become free from the hold of matter. Such people reach God, the Supreme.