The teacher-student relationship has been given a great importance in Hinduism. The guru occupies the divine pedestal as he or she can lead us to self-realisation by imparting the true knowledge.
On Guru Purnima, deep gratitude is expressed to our gurus and Ved Vyasa, the sage who codified the Vedas containing self-knowledge and enlightenment.
Here is my acrostic on GURU.
G: Great intellectual and wise person who
U: Ushers in the light of self-knowledge to
R: Remove the darkness of ignorance about the
U: Ultimate aim of human life which is liberation or self-realisation