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Bhagavad-gītā  As It Is
[Ch. 3]
na hi kaścit kṣaṇam api jātu tiṣṭhaty akarmakṛt kāryate hy avaśaḥ karma sarvaḥ prakṛti-jair guṇaiḥ
na —nor;  hi —certainly;  kaścit —anyone;  kṣaṇam —even a moment;  api —also;  jātu —even;  tiṣṭhati —stands;  akarma-kṛt —without doing something;  kāryate —forced to work;  hi —certainly;  avaśaḥ —helplessly;  karma —work;  sarvaḥ —everything;  prakṛti-jaiḥ —out of the modes of material nature;  guṇaiḥ —by the qualities.
TRANSLATION
All men are forced to act helplessly according to the impulses born of the modes of material nature; therefore no one can refrain from doing something, not even for a moment.
PURPORT
It is not a question of embodied life, but it is the nature of the soul to be always active. Without the presence of the spirit soul, the material body cannot move. The body is only a dead vehicle to be worked by the spirit soul, which is always active and cannot stop even for a moment. As such, the spirit soul has to be engaged in the good work of Kṛṣṇa consciousness, otherwise it will be engaged in occupations dictated by illusory energy. In contact with material energy, the spirit soul acquires material modes, and to purify the soul from such affinities it is necessary to engage in the prescribed duties enjoined in the  śāstras . But if the soul is engaged in his natural function of Kṛṣṇa consciousness, whatever he is able to do is good for him. The  Śrīmad-Bhāgavatam  affirms this:
tyaktvā sva-dharmaṁ caraṇāmbujaṁ harer bhajann apakvo ’tha patet tato yadi yatra kva vābhadram abḣūd amuṣya kiṁ ko vārtha āpto ’bhajatāṁ sva-dharmataḥ.
“If someone takes to Kṛṣṇa consciousness, even though he may not follow the prescribed duties in the  śāstras  nor execute the devotional service properly, and even though he may fall down from the standard, there is no loss or evil for him. But if he carries out all the injunctions for purification in the  śāstras , what does it avail him if he is not Kṛṣṇa conscious?” ( Bhāg.