Gotama, the author of Nyaya Sutras on Logic, defends the value of intellect as follows: Although the intellect admittedly cannot grasp reality (Brahman), it is nevertheless necessary in order to set a standard, to show what reality is, as such, so that it shall be recognized. A pair of scales cannot weigh themselves but they are necessary in order to weigh other things. Similarly, the intellect cannot yield reality but can measure it so to speak or indicate what is and what is not reality. Hence it is most valuable as a corrective to mysticism and yoga.
-- Notebooks Category 7: The Intellect > Chapter 2: The Service of Intellect > # 58