तत्त्ववित्तु महाबाहो गुणकर्मविभागयोः | गुणा गुणेषु वर्तन्त इति मत्वा न सज्जते ||३-२८||
tattvavittu mahābāho guṇakarmavibhāgayoḥ . guṇā guṇeṣu vartanta iti matvā na sajjate ||3-28||
Chapter 3 · Verse 28
Karma Yoga
कर्मयोग
In plain words
You should free yourself from anxiety by understanding that your senses are simply interacting with the material world. When you cultivate jnana, which is spiritual wisdom, you realize that nature's forces are merely acting upon nature itself. This keeps you unattached to the outcomes of your karma, or daily actions, because you know your true inner self remains untouched and peaceful.
Translation
3.28 But he who knows the truth about the division of the Gunas and works, O mighty-armed one, through his knowledge that 'Gunas operate on their products,' is not attached.
Meaning
He who knows the truth that the Self is entirely distinct from the three Gunas and actions does not become attached to the actions. He who knows the truth about the classification of the Gunas and their respective functions understands that the alities as senseorgans move amidst the alities as senseobjects. Therefore he is not attached to the actions. He knows. I am Akarta -- I am not the doer. (Cf. XIV.23).
Word by word
तत्त्ववित् the knower of the Truth तु but महाबाहो O mightyarmed गुणकर्मविभागयोः of the divisions of alities and functions गुणाः the alities (in the shape of senses) गुणेषु amidst the alities (in the shape of objects) वर्तन्ते remain इति thus मत्वा knowing न not सज्जते is attached.