"A GURU IS TO PUPIL WHAT A MOTHER IS TO HER CHILD" this line is well illustrated by SHREE SAI BABA while explaining about his Guru, which is as follows:
"My Guru never expected any other thing from Me. He never neglected Me, but protected Me at all times. I lived with him, and was sometimes away from him; still I never felt the want or absence of his love. He always protected Me by his glance, just as the tortoise feeds her young ones, whether they are near her or away from her on the other side of the river bank, by her loving looks. Oh mother, My Guru never taught Me any Mantra, then how shall I blow any Mantra in your ears? Just remember that Guru's tortoise-like loving glance gives us happiness. Do not try to get Mantra or Upadesh from anybody. Make Me the sole object of your thoughts and actions; and you will, no doubt, attain Paramartha (the spiritual goal of life). Look at Me whole-heartedly, and I in turn look at you similarly. Sitting in this Masjid, I speak the truth, nothing but the truth. No Sadhanas, nor proficiency in the six Shastras, are necessary. Have faith and confidence in your Guru. Believe fully, that Guru is the sole Actor or Doer. Blessed is he who knows the greatness of his Guru and thinks him to be Hari, Hara and Brahma (Trimurti) Incarnate."