This is the symptom of a pure devotee. One should serve the spiritual master first. It is not that one should bypass the spiritual master and desire to serve the Supreme Lord.This is not the Principle for a Vaishnava. — Srimad Bhagavatam, 07.09.28.
If you carry out the order of your spiritual master then the Lord will be so pleased that He will come to see you.
Our first duty is to satisfy the spiritual master, who can arrange for the Lord’s mercy. A common man must first begin to serve the spiritual master or the devotee. Then, through the mercy of the devotee, the Lord will be satisfied. Unless one receives the dust of a devotee’s lotus feet on one’s head, there is no possibility of advancement. Unless one approaches a pure devotee, he cannot understand the Supreme Personality of Godhead.
A disciple serves the spiritual master with the sole purpose of getting instructions from him.