The Verse 05.18.08 of "Shreemad Bhagavatam" is the amazing Praman for all those who adore Shree Lakshmi-Narasimha-Vidya and "Shree Narasimha-Tapani-Upanishad", because this Verse says about Bhagavan Shree Lakshmi-Narasimha being the Essence of ॐ (AUM, OM).
I have encountered this Praman while reading "Lakshmi Narasimha karavalambam - Srimad Mukkur Jeeyar" from SADAGOPAN.ORG.
And what makes this Verse more incredible is that it also dwells on क्ष्रौम् (KSHRAUM) BIJA of Bhagavan Shree Lakshmi-NaraSimha, that is this Verse tells about Tantrik Bija!
Another very interesting point to note is that