Arjuna asks about Life that seems and Soul beyond that sees, and what it is we know, or think we know. Krishna answers that this flesh is the field, and the Soul that views and knows it is the knower of the field. In every field, Krishna says, he is the knower.
The field includes the elements, the mind, the senses, desire and dislike, pleasure and pain. Krishna then lists what true wisdom looks like: humility, truthfulness, harmlessness, patience, self-control, a light hold on home, wife, and children, an even heart in good and bad fortune, and steady worship of him. Anything else is ignorance. He describes the Supreme as having hands, feet, and eyes everywhere, glorified in the senses yet beyond them, close to all and measurelessly far, the Light of Lights in the heart of the dark.
Nature and Spirit both have no beginning. Nature does the acting, and Spirit, bound to matter, feels pain and pleasure. Yet the Spirit within the body is also the Lord and witness, one Soul with him. Some find that Soul through meditation, some through study, some through work, and some by hearing of it from others and holding to it. Whoever sees the same living Soul in every form stops doing wrong to himself. Whoever sees that works are Nature's doing, and that the Soul is not the agent, reaches Brahma. Like the air, which avoids taint because it is so subtle, and like the sun, which is unchanged by what it lights, the Soul stays pure in every place.
Coming Up in Chapter 14
Krishna offers a wisdom of all wisdoms, and begins with the universe as a womb where he plants the seed of all lives. Then he names three qualities of Nature, called sattva, rajas, and tamas, which bind the changeless Spirit inside changeful flesh.