As the different limbs of the body cannot see the eyes, the living entities cannot see the Supreme Lord, who is situated as the Supersoul in everyone’s heart. Not by the senses, by the mind, by the life air, by thoughts within the heart, or by the vibration of words can the living entities ascertain the real situation of the Supreme Lord.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
यं वै न गोभिर्मनसासुभिर्वा हृदा गिरा वासुभृतो विचक्षते । आत्मानमन्तर्हृदि सन्तमात्मनां चक्षुर्यथैवाकृतयस्ततः परम्
yaṃ vai na gobhirmanasāsubhirvā hṛdā girā vāsubhṛto vicakṣate | ātmānamantarhṛdi santamātmanāṃ cakṣuryathaivākṛtayastataḥ param
SB 6.3.16