Chapter 14 · The Three Qualities · Krishna said
Bhagavad Gita 14.11 — Signs of sattva
सर्वद्वारेषु देहेऽस्मिन्प्रकाश उपजायते। ज्ञानं यदा तदा विद्याद्विवृद्धं सत्त्वमित्युत ॥
sarvadvāreṣu dehe'sminprakāśa upajāyate | jñānaṃ yadā tadā vidyādvivṛddhaṃ sattvamityuta ||
Meaning
When the light of knowledge shines through all the gates of the body, know that sattva has grown strong.