Śrīmad-Bhāgavatam · Text 11.10.17
Who is speaking and story frame
तत्रापि कर्मणां कर्तुरस्वातन्त्र्यं च लक्ष्यते ।
भोक्तुश्च दु:खसुखयो: को न्वर्थो विवशं भजेत् ॥ १७ ॥
tatrāpi karmaṇāṁ kartur
asvātantryaṁ ca lakṣyate
bhoktuś ca duḥkha-sukhayoḥ
ko nv artho vivaśaṁ bhajet
Although the performer of fruitive activities desires perpetual happiness, it is clearly observed that materialistic workers are often unhappy and only occasionally satisfied, thus proving that they are not independent or in control of their destiny. When a person is always under the superior control of another, how can he expect any valuable results from his own fruitive actions?
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.