एवं प्रवर्तितं चक्रं नानुवर्तयतीह यः।अघायुरिन्द्रियारामो मोघं पार्थ स जीवति॥
evaṃ pravartitaṃ cakraṃ nānuvartayatīha yaḥaghāyur indriyārāmo moghaṃ pārtha sa jīvati
Word by word
The verse says
Whoever does not keep this wheel turning lives for his senses alone, Arjuna. That life is wasted.
In plain words
The conclusion of the circuit argument, and it is blunt.
The wheel is turning. If you take from it and put nothing in, Krishna says you live mogham - vainly, to no purpose.
And indriyārāmaḥ - one who takes his pleasure in the senses. Not a monster. Just someone whose whole life happens inside his own appetites.
Where you've felt this · in failure
Your neighbour retired at fifty-five with enough money, and now arranges each year around getting slightly more of it. Nothing he does is wrong. He pays his taxes and is kind to everyone on the street. At sixty he notices there is nothing he is part of, and nobody who would ring him if he went quiet for a month.
Going deeper
Cakram - the wheel. This is the image the whole passage has been building, and it is the one worth carrying away.
A wheel is not a hierarchy. Nothing in it is at the top. It works by turning, and anything that stops turning stops it locally.
The charge against the man in this verse is not that he enjoys things. The Gita is not ascetic in that way. It is that he has become a place where the movement ends.
Mogham jīvati - he lives in vain. It is a hard sentence and it is worth resisting the urge to soften it. The claim is that a life that only consumes does not fail morally so much as fail structurally: it produces nothing that continues.
And this sets up the sharpest turn in the chapter. Krishna has just given a strong reason for everyone to keep working. In the very next verse he describes the one person who is exempt - and then, three verses later, tells Arjuna that even that person should work anyway.