They say to have learned even one letter or one word from someone, demands respect and consideration for him. So a person who walks on the spiritual path recognizes the goal towards which he is travelling, and realizes that the wealth he will obtain is so great that there is no return he can make which is in proportion to what he has received from his teacher. Therefore the chela (mureed, pupil) in the occult and mystical is more grateful to his master than any person in any other walk in life is to any other. Why is this? It is because he recognizes that there is nothing more precious and worthwhile in life than spiritual wealth and the light of wisdom. Whoever be the one who helped him to receive this light and wisdom, he is surely the archgate of heaven, the final goal into which he desires to enter. It is to this archgate that he makes his first bow. You find this expression in Hafiz and Sa'adi, and in many Sufi poets of Persia, calling their teacher the "arib," the arch, the arch of that gate which is the shrine of God.