Mandukya Karika 1.28
Sanskrit Verse
प्रणवं हीश्वरं विद्यात्सर्वस्य हृदि संस्थितम् ।
सर्वव्यापिनमोंकारं मत्वा धीरो न शोचति ॥ २८ ॥
Transliteration
praṇavaṃ hīśvaraṃ vidyātsarvasya hṛdi saṃsthitam |
sarvavyāpinamoṃkāraṃ matvā dhīro na śocati || 28 ||
Translation
Know Aum to be Īśvara, ever present in the mind of all; the man of discrimination realising Aum as all-pervading, does not grieve.

Muni's Play