Srila Prabhupada about vani and vaphu seva

Bhavananda Goswami: "Thank you very much and all the devotees for offering me a garland daily as you were doing when I was physically present. If a disciple is constantly engaged in carrying out the instructions of his spiritual master, he is supposed to be constantly in company with his spiritual master. This is called vani-seva. So there are two kinds of service to the spiritual master. One is called vani-seva and the other is called vapuh-seva. Vani-seva means - executing the instruction,' and vapuh-seva means -  physically personally rendering service.' So in the absence of physical presentation of the spiritual master, the vani-seva is more important."