Bhagavad Gita · Chapter 17: The Three Kinds of Faith

Bhagavad Gita 17.26

sadbhāve sādhubhāve ca sadityetatprayujyate | praśaste karmaṇi tathā sacchabdaḥ pārtha yujyate ||

"Sat" is used to mean what is real and what is good. The word "Sat" is also used, Arjuna, for an action that deserves praise.

Modern context

'Sat' means both what is real and what is good. In Sanskrit, the same word covers both. That is a profound idea: goodness and reality are not separate. To be good is to be in line with what truly is. An action that is truly good is also, in a deep sense, more real than one done from falsehood or selfishness.