Our temperaments are determined by a combination of the three gunas – sattva guna, rajo guna and tamo guna. Sattva guna is the highest and most sublime. It manifests itself as wisdom and serenity. Rajo guna manifests itself as dynamism and ambition. Tamo guna manifests itself as laziness and delusion.

Gunas are not visible and cannot be physically verified. We can infer which guna is predominant in a person by observing his external temperament. A sattvic person is calm and serene even in difficult situations. A rajasic person is swayed by his circumstances. A tamasic person is dull and non-responsive., not understanding what is happening around him.

The 20th, 21st and 22nd verses discuss the three levels of refinement of knowledge - sattvik, rajasik and tamasic. They discuss how people with these three gunas comprehend different situations.

The 20th verse describes the Sattvik nature of knowledge. “That knowledge by which one sees the one supreme reality which is immanent, which is all-pervading, which remains the same without division, which is the indweller in every being, is Sattvik knowledge.”

The person endowed with sattvik knowledge sees unity and oneness behind diversity. He sees humanity as one spiritual family. Even when perceiving the differences in the world, he keeps in mind the presence of the divine as the unifying factor everywhere.

This was the central theme of Swami Vivekananda’s talk in Chicago in 1983 at the Parliament of 
Religions. He emphasized the spiritual unity and oneness of creation.

21st verse: “That knowledge by which one sees everything as different from everything else, by which one sees certain people as eternally good and certain people as eternally bad, is Rajasik knowledge.”

The sattvik person also sees the differences, but he understands that the differences are not eternal. They are due to different temperaments driven by the three gunas. Behind them, he sees the unifying divine reality. The rajasik person sees the differences as eternal.

Sri Ramakrishna and Jesus Christ were born in two different cultures, spoke different languages, wore different types of dresses and used different parables. But behind these differences, there was unity at the spiritual level. The rajasic person overlooks the unifying principle and focuses on the differences. The sattvik person focuses on the unity. It is a matter of our spiritual evolution.,

22nd verse: “There are people who may have a small, petty idea, which may be irrational, but still they believe in that idea as being very great and are attached to it, and they think everyone should accept that idea, even though the idea is tribalistic and not humanistic – the knowledge of such people is Tamasik.”

The 23rd, 24th and 25th verses discuss the three levels of refinement of actions - sattvik, rajasik and tamasic. The way we act and perform our responsibilities is also a sign of spiritual growth.

Shankaracharya says in his commentaries: “The same divine principle is present in all living beings. It is called Atman. The way the Atman functions could be different from person to person, but the same Atman is present in all, as it is all-pervading. The differences in human emotions and feelings reflects in the way we deal with others.”

For example, in the 20th verse of the 17th chapter, Lord Krishna describes the sattvik level of charity. “Charity done with the attitude “It is my duty to help this person”, done in the right manner without any expectation of return, given to someone who is in need of it, who will use it for constructive purpose, and done at the right place and time – such charity is Sattvik.”

In the 22nd verse of the 17th chapter, Lord Krishna says: “Charity done at the wrong place, at the wrong time, or to unworthy person or without regard for rules and etiquette – such charity is Tamasik.”

23rd verse of 18th chapter: “When we do our actions considering it as our sacred duty, without extreme attachment, without aversion to anyone, without any selfish expectations of benefits – such action is Sattvik.”

Actions done without selfish motives and attachment keeps the mind tranquil and become a steppingstone and great help in our spiritual life. Actions done with selfish motives and attachment unsettles our mind and emotional system and take us backward in spiritual life.

24th verse: “Actions that are done with selfish desire, and which are done with strain to the mental system, are Rajasik.”

Such actions may give us empirical success, but they are accompanied by agony and anxiety. Workaholics are an example as they perform their actions with lot of calculations and expectations.

25th verse: “People who are reckless and ruthless, who do not worry about consequences, who are slaves of their impulses, who do not worry about loss of money or resources, who do not worry about whether their actions bring harm to others, who want to finish the action at any cost – their actions are tamasik.”