Verse 21

यथावर्तादितामेति द्रवत्वाद्वारि वारिणि ।तदाहंतादितामेति ज्ञप्ता ज्ञप्तौ ज्ञ आत्मनि

In plain words

Just as water, in water, comes to the state of a whirl through its own fluidity, so the knowing one, in jñapti, [that is] the knower, in the Self, comes to the state of "I"-ness and the rest.