"As a disciple you must regard your Guru as an Enlightened Being. Even if from his own point of view he is not Enlightened and you, his disciple, have gained Buddhahood before him, you must still show him respect and pay homage.

For instance, Maitreya, the fifth and next Buddha of the thousand of this world age, who now presides over Tusita Buddha-field, became Enlightened before his Guru, Sakyamuni Buddha. To demonstrate respect for his Guru, Maitreya has a stupa or reliquary monument on his forehead.

Likewise Avalokitesvara, the incarnation of the compassion of all the Buddhas, is crowned in his eleven-headed aspect with the head of his Guru, Amitabha Buddha, the one who presides over Sukhavati Buddha-field.
This learning from a Guru should not be like killing a deer to extract its musk and then discarding its corpse.

Even after attaining Enlightenment you must still continue to honor your Guru who made all your achievements possible."

Geshe Ngawang Dhargey