Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 38-40
यथोर्णनाभिर्हृदयादूर्णामुद्वमते मुखात् ।आकाशाद् घोषवान् प्राणो मनसा स्पर्शरूपिणा ॥ ३८ ॥छन्दोमयोऽमृतमय: सहस्रपदवीं प्रभु: ।ओङ्काराद् व्यञ्जितस्पर्शस्वरोष्मान्त स्थभूषिताम् ॥ ३९ ॥विचित्रभाषाविततां छन्दोभिश्चतुरुत्तरै: ।अनन्तपारां बृहतीं सृजत्याक्षिपते स्वयम् ॥ ४० ॥
yathorṇanābhir hṛdayādūrṇām udvamate mukhātākāśād ghoṣavān prāṇomanasā sparśa-rūpiṇā
Just as a spider brings forth from its heart its web and emits it through its mouth, the Supreme Personality of Godhead manifests Himself as the reverberating primeval vital air, comprising all sacred Vedic meters and full of transcendental pleasure. Thus the Lord, from the ethereal sky of His heart, creates the great and limitless Vedic sound by the agency of His mind, which conceives of variegated sounds such as the sparśas. The Vedic sound branches out in thousands of directions, adorned with the different letters expanded from the syllable om: the consonants, vowels, sibilants and semivowels. The Veda is then elaborated by many verbal varieties, expressed in different meters, each having four more syllables than the previous one. Ultimately the Lord again withdraws His manifestation of Vedic sound within Himself.
Śrīla Śrīdhara Svāmī has given an elaborate technical explanation of these three verses, the understanding of which requires extensive linguistic knowledge of the Sanskrit language. The essential point is that transcendental knowledge is expressed through Vedic sound vibration, which is itself a manifestation of the Absolute Truth, the Personality of Godhead. Vedic sound emanates from the Supreme Lord and is vibrated to glorify and understand Him. The conclusion of all Vedic sound vibration is found in Bhagavad-gītā, wherein the Lord states, vedaiś ca sarvair aham eva vedyaḥ: all Vedic knowledge is simply meant to teach us to know and love God. One who always thinks of Lord Kṛṣṇa, who becomes the Lord’s devotee and who bows down to and worships the Lord with faith and devotion, chanting His holy name, has certainly achieved a perfect understanding of all that is indicated by the word veda (“knowledge”).