Real knowledge is expounded in Bhagavad-gita: “Just become Krishna conscious. Just worship Krishna and become a devotee of Krishna.”
Srimad Bhagavatam 3.24.18,
Purpose of all knowledge is to convince us that we should love God.
Without perfect knowledge, one cannot act perfectly.
Knowledge of Krishna is such a great gift that it is impossible to repay the benefactor.
Srimad Bhagavatam 4.22.47,