Theoretical knowledge of Bhagavad Gita is not sufficient
Hare Krishna Friends,
If you follow these principles, controlling the senses, truthful, clean, full of knowledge, believing in the sastra and God, and vijnanam, practical application of knowledge in life. Vijnanam... Simply to know is useless. You must practically apply in life. That is called vijnanam. Practical examination. Those who are science students, they have to give, pass theoretical knowledge and practical knowledge also. Simply theoretical knowledge, "So much hydrogen, oxygen, makes water," that is theoretical. But when you mix up hydrogen, oxygen gas, and actually prepare water, that is called practical. So that is science. Science means simply theoretical knowledge is not sufficient. Observation and experiment. Experimental knowledge. That is called vijnanam.
Srila Prabhupada lecture-- London, July 19, 1973
Courtesy: 2001 The Bhaktivedanta Book Trust International.