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.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तैजसानीन्द्रियाण्येव ज्ञानकर्ममयानि च । तामसो भूतसूक्ष्मादिर्यतः खं लिङ्गमात्मनः
taijasānīndriyāṇyeva jñānakarmamayāni ca | tāmaso bhūtasūkṣmādiryataḥ khaṃ liṅgamātmanaḥ
SB 3.5.31