US-P18.083ab ।US-P18.083cd ॥
In plain words
The intellect is not the Seer, yet it shines always in the Seer's own form. So its thoughts must shine that way too — like sparks flying off iron that has been held in the fire.
Close to the Sanskrit
When the buddhi, which is not the Seer, always shines with the form of the Seer, then its cognitions too would be so — like the sparks of heated iron.