Faith in Guru and Surrender to Kṛṣṇa
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it is not possible to attain perfect knowledge through them. Therefore it is stated in  Bhagavad-gītā  that if we at all want to learn transcendental knowledge, we must approach one who has actually seen the Absolute Truth ( tad-viddhi praṇipāteṇa ). Traditionally,  brāhmaṇas  are meant to be spiritual masters, but in this age of Kali, it is very difficult to find a qualified  brāhmaṇa . Consequently it is very difficult to find a qualified spiritual master. Therefore Caitanya Mahāprabhu has recommended  kibāvipra ,  kibā nyāsī ,  śūdra kene naya/yei kṛṣṇa-tattva-vettā ,  sei ‘guru’ haya : “Whether one be a  brāhmaṇa  or a  śūdra  or a  sannyāsī  or a householder, it doesn’t matter. If he knows the science of Kṛṣṇa, he’s a bona fide spiritual master.”
Bhagavad-gītā  is the science of Kṛṣṇa, and if we study it scrutinizingly with all of our argument, sense and philosophical knowledge, we will come to know that science. It is not that we are to submit ourselves blindly. The spiritual master may be self-realized and situated in the Absolute Truth, yet we have to question him in order to understand all spiritual points. If one is able to factually answer the questions about the science of Kṛṣṇa, he is the spiritual master, regardless of where he is born or what he is—whether he be a  brāhmaṇa  or  śūdra  or American, Indian or whatever. When we go to a doctor, we do not ask him whether he is a Hindu, Christian or  brāhmaṇa . He has the qualification of a medical man, and we simply surrender, saying, “Doctor, treat me. I am suffering.”
Kṛṣṇa is the ultimate goal of spiritual science. Of course when we speak of Kṛṣṇa we refer to God.