बुद्धियुक्तो जहातीह उभे सुकृतदुष्कृते ।
तस्माद्योगाय युज्यस्व योगः कर्मसु कौशलम् ।।
buddhiyukto jahātīha ubhe sukṛtaduṣkṛte ।
tasmādyogāya yujyasva yogaḥ karmasu kauśalam ।।
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Just like how papa (sins) cause us to be dragged into samsara, so does punya.
A normal being desires of worldly desires & hence by his good deeds he expects to be in svarga after-life. But it's a stumbling block for moksha. One should avoid enjoying punya phala-s too!
One should be free of both the chains in order to become eligible for moksha
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One with samatva-buddhi stays away from punya/papa. Hence Arjuna, you be steadfastedly rooted in yoga. [Yoga here is to wisely perform karma-s]
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One with bhagavata-paroksha jnana stays away from punya/papa. Hence Arjuna, you must do the same. The 'bhagavata-paroksha' jnana is to understand that all karma-s are done for bhagavad-preethi with phala-s (outcomes) submitted at His Feet.