Sanskrit
सर्वद्वारेषु देहेऽस्मिन्प्रकाश उपजायते । ज्ञानं यदा तदा विद्याद्विवृद्धं सत्त्वमित्युत ॥
sarvadvāreṣu dehe'smin prakāśa upajāyate jñānaṃ yadā tadā vidyād vivṛddhaṃ sattvam ity uta
Translation
When the wisdom-light streameth forth from all the gates of the body, then it may be known that Harmony is increasing.
Annie Besant · The Bhagavad-Gita, translated by Annie Besant (4th ed., 1922) — Wikisource · Public Domain
Explanation
The first diagnostic sign, opening the triad that runs through verse 13: sattva increasing shows up as light and understanding streaming through “all the gates of the body” — the senses functioning as channels of clarity rather than distraction. Practical rather than abstract, this is Krishna teaching Arjuna to read his own inner state the way a physician reads symptoms.