Bhagavad Gita · Gunatraya Vibhaga YogaChapter 14, Shloka 19 (14.19)

Shankaracharya. guṇā eva sarvāvasthāḥ sarvakarmaṇāṃ kartāraḥ ity evaṃ paśyati, guṇebhyaś ca paraṃ guṇavyāpārasākṣibhūtaṃ vetti — the gunas alone are the doers of all actions, and beyond the gunas is the witness of their activity.

Acharya Ramanuja — with the means. evaṃ sāttvikāhārasevayā phalābhisandhirahitabhagavadārādhanarūpakarmānuṣṭhānaiḥ ca rajastamasī sarvātmanā abhibhūya utkṛṣṭasattvaniṣṭhaḥ — overcoming rajas and tamas through sattvic food and through actions of worship of the Lord done without desire for results, and becoming established in the highest sattva.

Shridhara Swami. guṇā eva karmāṇi kurvantīti paśyati, guṇebhyaś ca paraṃ vyatiriktaṃ tatsākṣiṇam ātmānaṃ vetti — one sees that "the gunas alone perform actions", and knows the Self beyond the gunas, their witness.

Madhusudana Saraswati. He gives a map of the chapter — three topics: the union of the field and the knower of the field depends on Ishvara; which gunas there are and how they bind; and (from here on) how to be freed from them.

Madhvacharya. He cautions that "there is no doer other than the gunas" does not mean a denial of Ishvara — pariṇāmikarttāraṃ guṇebhyo 'nyaṃ na paśyati — one sees no changing (parinami) doer other than the gunas; the Mundaka (3.1.3) too calls Ishvara the doer.