BG Chap 18 - Knowledge in the mode of goodness
The motivators of action and the constituents of action are all under the dictates of the modes of nature. The process of knowledge (jñanaṁ), which is a motivator, is equivalent to the instrument (karaṇaṁ), which is a constituent, where a person aims for knowledge thru his actions. Thus in performing actions, the process of knowing is also important. Being tinged by different guṇas, it produces different results. Thus knowledge, action and the doer are classified as three types according to the modes of nature.
That knowledge by which one sees one undivided spiritual nature in all types of bodies is in the mode of goodness. In this case one sees one indestructible jīva traveling successively in various destructible bodies of devas, men and other creatures as a result of accepting results of various karmas. Such knowledge of the soul which is non different from the knowledge in the Upaniṣads is knowledge in sattva guṇa.