oṁ ity ekākṣaraṁ brahma vyāharan mām anusmaran yaḥ prayāti tyajan dehaṁ sa yāti paramāṁ gatim

This verse indicates that omkara, or pranava, is a direct representation of the Supreme Personality of Godhead. Therefore if at the time of death one simply remembers omkara, he remembers the Supreme Personality of Godhead and is therefore immediately transferred to the spiritual world. Omkara is the basic principle of all Vedic mantras, for it is a representation of Lord Krsna, understanding of whom is the ultimate goal of the Vedas, as stated in Bhagavad-gita (vedais ca sarvair aham eva vedyah). Mayavadi philosophers cannot understand these simple facts explained in Bhagavad-gita, and yet they are very proud of being Vedantis. Sometimes, therefore, we refer to the Vedanti philosophers as having no teeth (danta means "teeth," and ve means "without"). The statements of the Saṅkara philosophy, which are the teeth of the Mayavadi philosopher, are always broken by the strong arguments of Vaisnava philosophers such as the great acaryas, especially Ramanujacarya. Sripada Ramanujacarya and Madhvacarya break the teeth of the Mayavadi philosophers, who can therefore be called Vedantis in the sense of "toothless."