"On the spiritual strength, the body moves. Suppose you have got a very good car, Mercedes car or Rolls Royce car, but when there is no petrol, how the car will move? It is not possible. There is spirit, petrol spirit. Similarly, real strength is spiritual strength.
"That spiritual strength is Balarama. Bala means strength. Therefore we have to take shelter of the lotus feet of Balarama, guru-tattva. Balarama means guru-tattva. Balarama represents guru. Yasya prasadad bhagavat-prasadah. If we want to understand Caitanya Mahaprabhu, if we want to understand Krishna, then we must take shelter of Balarama. Nayam atma bala-hine na labhya. This bala- hinena labhya, this Vedic injunction, means 'Without the mercy of Balarama you cannot understand, you cannot realize your spiritual identification.'"
(Srila Prabhupada lecture, February 2, 1977)