CC Madhya 25.125
bhakta-gaṇe sphuri āmi bāhire-antare
“ ‘The five material elements are existing inside and outside of every living entity. Similarly, I, the Supreme Personality of Godhead, am manifest within the heart of the devotee as well as outside his body.
The pure devotee knows that he is a servant of Kṛṣṇa eternally. He knows that everything can be used in the service of the Lord.