मनो ब्रह्मेत्युपासीतेत्यध्यात्ममथाधि-दैवतमाकाशो ब्रह्मेत्युभयमादिष्टं भवत्य-ध्यात्मं चाधिदैवतं च ॥ १ ॥
In plain words
Meditate upon the mind as Brahman: this is the inner path. And meditate upon space as Brahman: this is the cosmic path. Both teachings are thus laid before you.
Close to the Sanskrit
One should meditate upon the mind as Brahman--this is pertaining to the individual self. Now, pertaining to the cosmic deities: space is Brahman. Both are thus taught, both the internal and the cosmic.