Verse
सद्भावे साधुभावे च सदित्येतत्प्रयुज्यते ।प्रशस्ते कर्मणि तथा सच्छब्दः पार्थ युज्यते ॥
sadbhāve sādhubhāve ca sadityetatprayujyatepraśaste karmaṇi tathā sacchabdaḥ pārtha yujyate
Sat means good and it means existence; likewise, O Partha, the word Sat is used in the sense of a good work (for all good works prepare the soul for the higher reality of our being).
Gītā 17·26