। ॥ ४५ ॥
In plain words
Vijñāna is recognizing Kṣetrajña, the knower within, as one with Paramātman, the supreme Self. What Śāstra gives is Parokṣa-jñāna, knowledge at second hand; Vijñāna is Ātma-darśana, seeing the Self directly.
Close to the Sanskrit
Vijñāna is the oneness of the two—Kṣetrajña and Paramātman. Jñāna born of Śāstra is Parokṣa, indirect; Vijñāna is Ātma-darśana, direct seeing of Ātman.