B.G 3.04

न कर्मणामनारम्भान्नैष्कर्म्यं पुरुषोश्नुते। न च संन्यसनादेव सिद्धिं समधिगच्छति ॥४॥

na karmaṇāmanārambhānnaiṣkarmyaṁ puruṣōśnutē। na ca saṁnyasanādēva siddhiṁ samadhigacchati ॥4॥

No one attains perfection by non-commencement of work, or by inaction, nor does one attain the goal by mere renunciation.

Gīta Tātparya 3.04

Self-less action results in knowledge. Without knowledge, there can be no liberation.

"The Janānin will finally get liberated is the rule. Similarly, benevolent act always increase bliss, and others decrease it. The action results in knowledge."

- states Parama Vedic testimonial.

Testimonials such as "not by action, not by progeny, not by wealth" are not opposed (to performing action intending to gain knowledge). Otherwise, there is opposition to the statement "Not by merely abstaining from work" which is a testimonial with equal weight. Regarding equivalent statements, there can't be contradiction, is the rule. There also exist testimonials that state "there is no other way", that indicate without knowledge there can be no liberation.

Note: Following verse is quoted:
न कर्मणा न प्रजया धनेन त्यागेनैके अमृतत्वमानशुः| परेण नाकं निहितं गुहायां विभ्राजते यद्यतयो विशन्ति॥
The self-controlled, who are of pure minds have well ascertained the Reality and state: "Higher than heaven, seated in the cave (Buddhi), that shines, (which) the self-controlled attain. Not by work, nor by progeny, nor by wealth, but only by renunciation, they attained immortality."
- Kaivalya Upanishad