Steadfastness in sacrifice, austerity and gift, is also called “sat”; and also action in connection with these (or for the sake of the supreme) is called “sat.”
Whatever is sacrificed, given or performed, and whatever austerity is practiced without faith, it is called “asat,” Oh Arjuna. It is naught here or hereafter (after death).
Credits: Blogger via Global Organization of Hindus and Facebook