Our Vedic system. It is advised, tad vijñānārthaṁ sa gurum eva abhigacchet (MU 1.2.12). That is the system. Just like you are a medical man. To acquire your knowledge, you had to accept the medical college, the professors.
So this is natural. If we want to know something which is not, or which is unknown to me, then we have to accept a guru, a superior man. Guru means superior man. Tad vijñānārthaṁ sa gurum eva abhigacchet. Guru means "heavy," or "superior." That is the law.
So our process of Vedic knowledge is that we get knowledge from the superior just like Brahmā, Lord Brahmā. He's the first, original creature within this universe. And he got knowledge from God, Kṛṣṇa, the Absolute. The Vedas means the knowledge which he heard . . .
Tene brahma hṛdā ādi-kavaye. So there is sampradāya. Brahmā imparted this knowledge to Nārada. Nārada imparted this knowledge to Vyāsadeva. Evaṁ paramparā. That . . . this is our process of knowledge. We get knowledge from the superior. Everyone gets knowledge from the superior. Nobody gets knowledge automatically. That is not possible.
So things which are beyond the perception of our senses, how we can get that knowledge? By our mental speculation, it is not . . . never perfect. We give sometimes this example: Just like we, if we want to know who is my father, that is not possible to know simply by mental speculation. If we approach the authority, mother, we get the knowledge immediately.