Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 31
तैजसानीन्द्रियाण्येव ज्ञानकर्ममयानि च ॥ ३१ ॥
taijasānīndriyāṇy evajñāna-karma-mayāni ca
The senses are certainly products of the mode of passion in false ego, and therefore philosophical speculative knowledge and fruitive activities are predominantly products of the mode of passion.
The chief function of the false ego is godlessness. When a person forgets his constitutional position as an eternally subordinate part and parcel of the Supreme Personality of Godhead and wants to be happy independently, he functions mainly in two ways. He first attempts to act fruitively for personal gain or sense gratification, and after attempting such fruitive activities for a considerable time, when he is frustrated he becomes a philosophical speculator and thinks himself to be on the same level as God. This false idea of becoming one with the Lord is the last snare of the illusory energy, which traps a living entity into the bondage of forgetfulness under the spell of false ego. The best means of liberation from the clutches of false ego is to give up the habit of philosophical speculation regarding the Absolute Truth. One should know definitely that the Absolute Truth is never realized by the philosophical speculations of the imperfect egoistic person. The Absolute Truth, or the Supreme Personality of Godhead, is realized by hearing about Him in all submission and love from a bona fide authority who is a representative of the twelve great authorities mentioned in the Śrīmad-Bhāgavatam. By such an attempt only can one conquer the illusory energy of the Lord, although for others she is unsurpassable, as confirmed in Bhagavad-gītā (7.14).