Spiritual affair means that... We are in this material world. We are suffering. When the question will come in one's mind, "Why I am suffering?" that is spiritual. Just like an animal is being taken to the slaughterhouse. He cannot inquire, "Why I am being taken to the slaughterhouse?" But if a man is being taken forcibly, he'll protest; he will cry; he'll call crowd. Therefore human being can inquire about spiritual affair. So when there is spiritual inquiry, then one requires a guru. And by going to guru, as it is stated, tad viddhi praṇipātena paripraśnena sevayā (BG 4.34). One has to learn by surrendering, praṇipāta. So first of all there must be a strong impulse to inquire about the transcendental subject matter. Then one requires a guru. Not that, to follow a fashion, that one has guru. Ācāryavān puruṣo veda. Unless one becomes under the control of ācārya, he has no perfect knowledge.