B.G 18.23
niyataṁ saṅgarahitam arāgadveṣataḥ kṛtam। aphalaprepsunā karma yat tat sāttvikam ucyate ॥23॥
An action that is regulated and free from attachment, performed without passion or hatred, and without desire for results, is considered to be in the mode of 'sāttvik', i.e. goodness.
Gīta Tātparya 18.23
Understanding the supreme nature of Lord Vishnu, performing all actions as an offering to the Lord is a means to liberation. While non-performance leads to sin.
"mayi sarvāṇi karmāṇi saṃnyasyādhyātmacetasā" ityuktvā "ye me matam", "ye tvetat" iti ca tasya mokṣasādhanatvasyākaraṇe pratyavāyasya cokterbhagavadarpitatvena sarvakarmakaraṇaṃ tasya viṣṇoḥ sarvaparamatvajñānaṃ ca niyatameveti jñāyate।
"Renouncing all actions in me with a mind absorbed in the self" (3.30), "Those are my opinion" (3.31), "But those who" (3.32) - these statements conveys that understanding the supreme nature of Lord Vishnu, ensures that performing all actions as an offering to the Lord is a means to liberation, while non-performance leads to sin.
"adhyātmacetasā" ityuktatvāt tatsvarūpayāthārthyajñānādi। "ye tu sarvāṇi" ityasmin ślokédhyātmacetastvasya "matparāḥ ananyenaiva yogena māṃ dhyāyantaḥ" iti vyākhyātatvāt।
"One who surrenders his 'atman' to Bhagavan," (3.30) stating thus it is conveyed true knowledge is understanding the essence of true principles. The verse, "those who, but all," (12.6) referring to the state of mind absorbed in the Lord, "devoted to me, meditating on me with undivided yoga," (12.6) as it is explained.
evaṃ sarvamapi bhagavadbhaktiyuktameva sāttvikam॥
Thus, everything associated with devotion to the Lord is considered 'sāttvik'.