Shiva Purana
प्रणवार्थपरिज्ञानमेव ज्ञानं मदात्मकम् ॥ बीजन्तत्सर्वविद्यानां मंत्र म्प्रणवनामकम् ॥ २ ॥
To understand the meaning of Praṇava is to understand me. Praṇava is the seed of all the lores.
english translation
praNavArthaparijJAnameva jJAnaM madAtmakam ॥ bIjantatsarvavidyAnAM maMtra mpraNavanAmakam ॥ 2 ॥
hk transliteration by Sanscript