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

When the light of knowledge shines forth through all the gates of this body, then one should know that clarity has increased.

Krishna now gives signs by which each quality can be recognised. When clarity (sattva) prevails, light and knowledge shine through all the gates of the body, meaning the senses through which we meet the world. One sees clearly, hears attentively and understands well. The image of the body as a city with gates appears elsewhere in the Gita too. The verse turns the teaching on the qualities into something practical. Arjuna can look at his own experience and know from the quality of his perception which force is strongest in him at a given moment.