CHAPTER 7 · VERSE 13
Bhagavad Gita 7.13
त्रिभिर्गुणमयैर्भावैरेभिः सर्वमिदं जगत्। मोहितं नाभिजानाति मामेभ्यः परमव्ययम्॥
Deluded by these states composed of the three modes of nature, this entire world does not recognize Me, who am beyond them and imperishable.
Explains why humanity fails to perceive God: the mind gets caught in the illusions created by the three material Gunas.