Those who are inquisitive to understand higher scientific knowledge, uttamam. Uttama means higher. Uttama, madhyama, adhama. There are three words: first class, second class, third class. So spiritual knowledge is uttamam. Anyone who is inquisitive to understand first-class knowledge, he requires to go to a guru. Those who are interested in third-class knowledge, they do not require any guru.
Third-class knowledge means animal knowledge: how to eat, how to sleep. How to make arrangement for eating, how to make arrangement for sleeping, that is third-class knowledge. Because the animal also try for this kind of knowledge, how to eat, how to sleep. Therefore this kind of knowledge is third-class knowledge.
And second-class knowledge is "What I am?" Athāto brahma jijñāsā. The Vedānta. That is second-class knowledge. And first-class knowledge, when he actually understands what he is—he is eternal servant of Kṛṣṇa—and engages himself in the service of the Lord, that is first-class knowledge. And therefore, as soon as he comes to the first-class knowledge platform, he becomes happy.