So here also, the Lord says that tad viddhi: "If you want to understand that transcendental subject matter, then you must approach a person, a bona fide spiritual master."
And the process is praṇipāta, praṇipātena. Praṇipāta means full surrender. Pra means prakṛṣṭa-rūpeṇa, fully, and nipāta means completely becoming a blank slate. Blank slate. Nobody should approach a bona fide spiritual master just to argue with him and just to, with a desire that "I shall see what kind of spiritual master." No. This is useless. You have to select a spiritual master...
My Guru Mahārāja, my spiritual master, used to say that you have to select a spiritual master not by seeing but by your ear, but by hearing. And you don't select a spiritual master who has got a very good hair or beard or some very beautiful feature, "Oh, he is a very good, nice looking." No. You must hear. Tad viddhi praṇipātena (BG 4.34). Śruti. The whole process is śruti.