Om: The Sound Brahman
सर्वे वेदा यत्पदमामनन्ति
तपाꣳसि सर्वाणि च यद्वदन्ति ।
यदिच्छन्तो ब्रह्मचर्यं चरन्ति
तत्ते पदꣳ संग्रहेण ब्रवीम्योमित्येतत् ॥ १५॥
sarve vedā yatpadamāmananti
tapāgͫsi sarvāṇi ca yadvadanti .
yadicchanto brahmacaryaṃ caranti
tatte padagͫ saṃgraheṇa bravīmyomityetat .. 15..
Yama said: The goal which all the Vedas declare, which all austerities aim at and which men desire when they lead the life of continence, I will tell you briefly: it is Om.
Swami Vivekananda Says —
That which all the Vedas declare, which is proclaimed by all penances, seeking which men lead lives of continence, I will tell you in one word — it is ‘Om’.”
You will find this word “Om” praised very much in the Vedas, and it is held to be very sacred.[Source]