B.G 3.34
iṁdriyasyēṁdriyasyārthē rāgadvēṣau vyavasthitau। tayōrna vaśamāgacchēt tau hyasya paripanthinau ॥34॥
By senses dwelling on sense objects, attachement and aversion necessarily arise. Let not one come under the sway of these two. Indeed, they are obstacles.
Gīta Bhāshya 3.34
It is possible to alter the past impressions with intense effort.
tathāpi śaktitō nigrahaḥ kāryaḥ। nigrahāt sadyaḥ prayōjanābhāvē'pi bhavatyēva atiprayatnataḥ ityāśayavānāha - iṁdriyasyēti॥
Even then (though driven by prakrti), one must pursue restraining (of Indriyas) as per one's capacity. Even though it may not have immediate purpose, restraining with an intense effort indeed yields results. With this intention it is said - 'iṁdriyasyē', i.e. 'from Indriyas', verse.
tathā hi uktam-
Therefore, it is specifically said:
"saṁskārō balavānēva brahmādyā api tadvaśāḥ। tathāpi sō'nyathākartuṁ śakyatē'tiprayatnataḥ॥"
"The past impressions are so powerful that even the celestial beings come under its sway. Nevertheless, with intense effort, it is possible to alter its impact.
iti ॥34॥
-states testimonial.