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Śrīmad-Bhāgavatam
[Canto 7, Ch. 10]
bhogena puṇyaṁ kuśalena pāpaṁ kalevaraṁ kāla-javena hitvā kīrtiṁ viśuddhāṁ sura-loka-gītāṁ vitāya mām eṣyasi mukta-bandhaḥ
bhogena —by feelings of material happiness;  puṇyaṁ —pious activities or their results;  kuśalena —by acting piously (devotional service is the best of all pious activities);  pāpaṁ —all kinds of reactions to impious activities;  kalevaraṁ —the material body;  kāla-javena —by the most powerful time factor;  hitvā —giving up;  kīrtiṁ —reputation;  viśuddhāṁ —transcendental or fully purified;  sura-loka-gītāṁ —praised even in the heavenly planets;  vitāya —spreading all through the universe;  mām —unto Me;  eṣyasi —you will come back;  mukta-bandhaḥ —being liberated from all bondage.
TRANSLATION
My dear Prahlāda, while you are in this material world you will exhaust all the reactions of pious activity by feeling happiness, and by acting piously you will neutralize impious activity. Because of the powerful time factor, you will give up your body, but the glories of your activities will be sung in the upper planetary systems, and being fully freed from all bondage, you will return home, back to Godhead.
PURPORT
Śrīla Viśvanātha Cakravartī Thākura says:  evaṁ prahlādasyāṁśena sādhana-siddhatvaṁ nitya-siddhatvaṁ ca nāradādivaj jñeyam.  There are two classes of devotees—the  sādhana-siddha  and the  nitya-siddha . Prahlāda Mahārāja is a mixed  siddha ; that is, he is perfect partly because of executing devotional service and partly because of eternal perfection. Thus he is compared to such devotees as Nārada. Formerly, Nārada Muni was the son of a maidservant, and therefore in his next birth he attained perfection ( sādhana-siddhi ) because of having executed devotional service. Yet he is also a  nitya-siddha  because he never forgets the Supreme Personality of Godhead.
The word  kuśalena  is very important. One should live in the material world very expertly. The material world is known as the world of duality