। ॥ १९१ ॥
In plain words
This self-luminous Self, manifest as understanding, shines in the heart among the vital breaths. Though changeless, when associated with the limiting adjunct of the intellect it appears as the doer and the experiencer.
Close to the Sanskrit
This vijñānamaya, which shines self-luminous amid the vital breaths, in the heart — though being the changeless Self (kūṭastha), it becomes, when situated in the limiting adjunct, the doer and the enjoyer.