Text 16

bahir antas ca bhutanam
acaram caram eva ca
suksmatvat tad avijneyam
dura-stham cantike ca tat

Translation

The Supreme Truth exists outside and inside of all living beings, the moving and the nonmoving. Because He is subtle, He is beyond the power of the material senses to see or to know. Although far, far away, He is also near to all.

Commentary by Srila Prabhupada

In Vedic literature we understand that Narayana, the Supreme Person, is residing both outside and inside of every living entity. He is present in both the spiritual and material worlds. Although He is far, far away, still He is near to us. These are the statements of Vedic literature. 

Asino duram vrajati sayano yati sarvatah (Katha Upanishad 1.2.21). And because He is always engaged in transcendental bliss, we cannot understand how He is enjoying His full opulence. We cannot see or understand with these material senses. Therefore in the Vedic language it is said that to understand Him our material mind and senses cannot act. But one who has purified his mind and senses by practicing Krishna consciousness in devotional service can see Him constantly. It is confirmed in Brahma-samhita that the devotee who has developed love for the Supreme God can see Him always, without cessation. And it is confirmed in Bhagavad-gita (11.54) that He can be seen and understood only by devotional service. Bhaktya tv ananyaya sakyah.

Commentary by Sri Visvanatha Cakravarti Thakur

He exists within and outside of all living entities, who are his products (bhutanam means arising from him), just as ether and other elements exists within and outside all bodies of which they are the cause. All non-moving and moving beings are only the Lord, since he is the cause and they are the effect. He cannot be clearly known (tad avijneyam). In other words, for the ignorant he is situated far away at millions of yojanas distance and for the wise he is near, as if living in his own house, since he is situated as the antaryami within the person. The sruti says:

durat sudure tad ihantike ca pasyatsv ihaiva nihitam guhayam

It is further than far, and very close. In the body it is situated in the heart, in those who see. Mundaka Upanisad 3.1.7