You can never repay your Guru for what he has given you, because material treasures cannot pay for spiritual goods, yet the scriptures state emphatically that you must serve your Guru with body, mind and wealth. Your Guru is not stingy with the spiritual gifts he showers upon you, nor does He ever tire of giving you grace. Why do you think that you have served Him enough?
Be greedy in serving the Guru. The best disciple is he who renders service without the Guru asking for it.
........JAGADGURU SHRI KRIPALUJI MAHAPRABHU.