In plain words
The Self never changes. The intellect has no awareness of its own. Yet the individual formed where the two are joined takes itself to be the one who knows, does and sees everything. See how deep that delusion is.
Word for word
The Self is ever changeless, and intellect has no awareness of its own. Nevertheless, the individual formed through their conjunction holds the notion ‘I know, do and see everything’. See that this is great delusion.