In the Bhagavad-gītā, the Absolute Truth, Kṛṣṇa, is explaining Himself. Absolute Truth is the ultimate end, Vedānta. The subject matter of knowledge is Absolute Truth. Athāto brahma jijñāsā. So we have got this human form of life to inquire about the Absolute Truth. Jijñāsuḥ śreyaḥ uttamam. Tasmād guruṁ prapadyeta jijñāsuḥ śreyaḥ uttamam (SB 11.3.21). Unless one is jijñāsuḥ, inquisitive, there is no need of accept a so-called fashionable guru. To accept guru is not a fashion, style, that "Everyone has guru; I'll have a guru." No. The śāstra says, tasmād guruṁ prapadyeta jijñāsuḥ śreyaḥ uttamam: One should accept guru when he is inquisitive, jijñāsuḥ. What about? Śreyaḥ uttamam, the Absolute, or the auspicity, beyond this material world. Uttamam. Tamaḥ means darkness, ignorance.
So here, our position in this material world: darkness. We are simply speculating in so many ways what is the ultimate cause. There are so many philosophers, but they are speculating only, without any definite knowledge. So śāstra says that speculative knowledge will not be successful at any time.