(Srila Prabhupada bowing down before Sri Sri Radha-Gopinatha, New Remuna Dhama, Toronto, 1976)
"You don't require what is large defintion of guru. So Vedic knowledge gives you indication that tad- vijnanartham. If you want to know the science of spiritual life, tad-vijnanartham sad gurum abhigaccet, you must approach guru. And what is guru?Guru means who is faitfhful servant of God. Very simple."