The Personality of Godhead Lord Śrī Kṛṣṇa is in every living being along with the individual soul. And this fact is perceived and hypothesized in our acts of seeing and taking help from the intelligence.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
भगवान् सर्वभूतेषु लक्षितः स्वात्मना हरिः । दृश्यैर्बुद्ध्यादिभिर्द्रष्टा लक्षणैरनुमापकैः
bhagavān sarvabhūteṣu lakṣitaḥ svātmanā hariḥ | dṛśyairbuddhyādibhirdraṣṭā lakṣaṇairanumāpakaiḥ
SB 2.2.35