रजस्तमश्चाभिभूय सत्त्वं भवति भारत।रजः सत्त्वं तमश्चैव तमः सत्त्वं रजस्तथा॥
rajas tamaś cābhibhūya sattvaṃ bhavati bhāratarajaḥ sattvaṃ tamaś caiva tamaḥ sattvaṃ rajas tathā
Word by word
The verse says
Clarity rises, Arjuna, by overcoming drive and heaviness. Drive rises by overcoming clarity and heaviness. And heaviness rises by overcoming clarity and drive.
In plain words
A rotation, stated three times so you cannot miss it.
None of them is a baseline. Each rises by pushing the other two down, and then gets pushed down in turn.
This is weather, not character.
Where you've felt this · in family life
In one house the evening starts brisk. Everybody is getting things done. By eight it has turned sharp and two of them are arguing. By ten they are slumped in front of something nobody is watching. Nothing happened. The same four people had three different evenings.
Going deeper
Describing the three as a rotation removes the idea that anybody has a settled type.
It is tempting to read the strands as personality: he is a driven person, she is a calm one. The verse makes that impossible. All three are present in everybody and each takes its turn by displacing the others. What varies between people is the proportion over time, not which one they have.
That is also why the chapter can treat them as weather rather than as moral categories.
For a reader this is the most immediately usable idea in the chapter. The flat Sunday is not evidence of what you are. The sharp productive Tuesday is not either. Both are passing conditions of the same field, and treating either as information about your character is the error the next ten verses are built to correct.