Guru Gita
guruvaktṛe sthitaṁ brahma prāpyate tatprasādataḥ | gurordhyānaṁ sadā kuryāt kulastrī svapatiṁ yathā ||
**Brahman resides in the mouth of the Guru (i.e. Guru's vāk or Sarasvati Nāḍi, the inner organ that converts energy into words) and Brahman is attained by the grace of the Guru, Guruprasād. One should meditate on his Guru at all times, just as a devoted wife would remember her husband only.**