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Rāja-vidyā: The King of Knowledge
philanthropic work by opening some hospitals or engaging in politics. The hospital-making business is being conducted by the government; it is the duty of a  sannyāsa  to make hospitals whereby people can actually get rid of their material bodies, not patch them up. But for want of knowing what real spiritual activity is, we take up material activities.
By becoming perfect in Kṛṣṇa consciousness, knowledge and wisdom are found in due course of time. There may be some discouragement at first, but the word  kālena , meaning “in due course of time,” indicates that if we simply persevere we will be successful. Faith is required, as stated in the next verse.
śraddhāvāl labhate jñānam 
  tat-paraḥ samyatendriyaḥ 
  jñānam labdhvā parām śāntim 
  acireṇādhigacchati
“A faithful man who is absorbed in transcendental knowledge and who subdues his senses quickly attains the supreme spiritual peace.” (Bg. 4.39)
For those who are hesitant and have no faith, Kṛṣṇa consciousness is very difficult. Even in our daily affairs a certain amount of faith is required. When we buy a ticket, we have faith that the airline company will take us to our destination. Without faith we cannot even live in the material world, what to speak of making spiritual progress. Where are we to keep our faith? In the authority. We should not book our ticket with an unauthorized company. Faith must be in Kṛṣṇa, the speaker of  Bhagavad-