। ॥ १६ ॥
In plain words
If you have faith, use Buddhi's own vṛttis — the intellect's movements — to contemplate this one thing: that you are Brahman. Know it truly, as far as your strength reaches, by working through the sentence — and then go over it again and again, always.
Close to the Sanskrit
The faith-filled one should contemplate his own Brahman-hood by means of Buddhi's vṛttis — the intellect's modifications; having truly known it through the working of the sentence, according to capacity, let it be practised always.