Two Brahmas should be known viz., the Brahma represented by the Vedas and that which is beyond the Vedas and is supreme. One who is conversant with Brahma represented by sound succeeds in attaining to Brahma that is Supreme.
द्वे ब्रह्मणी वेदितव्ये शब्दब्रह्म परं च यत्। शब्दब्रह्मणि निष्णातः परं ब्रह्माधिगच्छति॥