Mandukya Karika, verse 4.96

Text

अजेष्वजमसंक्रान्तं धर्मेषु ज्ञानमिष्यते ।
यतो न क्रमते ज्ञानमसंगं तेन कीर्तितम् ॥ ९६ ॥

ajeṣvajamasaṃkrāntaṃ dharmeṣu jñānamiṣyate |
yato na kramate jñānamasaṃgaṃ tena kīrtitam || 96 ||

96. Knowledge (consciousness), the essence of the Jīvas (who are unborn), is admitted to be itself unborn and unrelated (to any external object). This knowledge is proclaimed to be unconditioned as it is not related to any other object (which, really speaking, does not exist).

Shankara Bhashya (commentary)

What constitutes the highest Wisdom (i.e., the wisdom of the knower of the non-dual Ātman)? This is thus explained: Knowledge which constitutes the essence of the Dhūrmas (Jīvas), unborn, immutable and identical with Ātman, is also admitted to be unborn1 and immutable. It is just like the light and the heat belonging to the sun. Knowledge, being ever unrelated to other2 objects, is said to be unborn. As knowledge is, thus, unrelated to other objects, it is like the Ākāśa, called unconditioned or absolute.