Shiva Purana
श्रवणं सर्वशब्दानां श्रवणे चाप्रयत्नतः ॥ वार्त्ता वार्त्तासु विज्ञानं सर्वेषामेव देहिनाम् ॥ १२ ॥
Śravaṇa is the ability to hear all sounds without any strain. Vārtā is the knowledge of everything concerning all embodied beings.
english translation
zravaNaM sarvazabdAnAM zravaNe cAprayatnataH ॥ vArttA vArttAsu vijJAnaM sarveSAmeva dehinAm ॥ 12 ॥
hk transliteration by Sanscript