Bhagavad Gita 14.11

सर्वद्वारेषु देहेऽस्मिन्प्रकाश उपजायते।ज्ञानं यदा तदा विद्याद्विवृद्धं सत्त्वमित्युत ॥१४.११॥

sarvadvāreṣu dehe’sminprakāśa upajāyatejñānaṃ yadā tadā vidyādvivṛddhaṃ sattvamityuta

When the wisdom-light shines through every gate of this body, then it may be known that Sattva is predominant.

गीता