'Gu' stands for Gunatheeta (attributeless). 'Ru' signifies Rupavarjita (formless).The Sanskrit root "Gu" means darkness or ignorance. "Ru" denotes the remover of that darkness.Therefore one who removes darkness of our ignorance is a Guru. Only he who removes our ultimate darkness, known as Maya, and who inspires and guides us on to the path of God-realization is the true Guru (Gukaaro Andhakaarasya, Rukarasthannirodhakaha). So, God, who is attributeless and formless, is the true Guru.
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