Faith in Guru and Surrender to Krṣṇa
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gītā . How do we become faithful? Control of the senses ( samyatendriyaḥ ) is required. We are in the material world because we want to gratify our senses. If we have faith that a physician can cure us, and he tells us not to eat such and such, and we eat it anyway, what kind of faith do we have? If we have faith in our physician, we will follow his prescriptions for cure. The point is that we have to follow the instructions with faith. Then wisdom will come. When we attain to the stage of wisdom, the result is  parām śāntim —supreme peace. Krṣṇa indicates that when one controls the senses, faith comes in the near future ( acireṇa ). Having attained that stage of faith in Krṣṇa, one feels that he is the happiest man in the world. This is our position. We have to accept the formula and execute it with faith. This faith must be in the supreme authority, not in a third class man. We must search out a spiritual master in whom we can have faith. Krṣṇa is the most authorized personality, but anyone who is Krṣṇa conscious can be accepted because a person fully in Krṣṇa consciousness is the bona fide representative of Krṣṇa. Having tasted the words of Krṣṇa's representative, we will feel satisfied, just as we feel satisfied upon eating a full meal.
ajñaś cāśraddadhānaś ca 
    samśayātmā vinaśyati 
    nāyam loko 'sti na paro 
    na sukham samśayātmanaḥ
“But ignorant and faithless persons who doubt the revealed scriptures do not attain God consciousness.