Gita Chapter 17.26 to 17.28

Sadbhaave saadhubhaave cha sadityetatprayujyate;
Prashaste karmani tathaa sacchabdah paartha yujyate.
26. The word Sat is used in the sense of reality and of goodness; and so also, O Arjuna, it is used in the sense of an auspicious act!

Yajne tapasi daane cha sthitih saditi chochyate;
Karma chaiva tadartheeyam sadityevaabhidheeyate.
27. 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.

Ashraddhayaa hutam dattam tapastaptam kritam cha yat;
Asadityuchyate paartha na cha tatpretya no iha.
28. Whatever is sacrificed, given or performed, and whatever austerity is practised without faith, it is called Asat, O Arjuna! It is naught here or hereafter (after death).
COMMENTARY: Whatever sacrifice, austerity or charity done without being dedicated to the Lord will be of no avail to the doer in this earthly life here or in the life beyond hereafter.

Hari Om Tat Sat

Iti Srimad Bhagavadgeetaasoopanishatsu Brahmavidyaayaam

Yogashaastre Sri Krishnaarjunasamvaade

Shraddhaatrayavibhaagayogo Naama Saptadasho’dhyaayah

Thus in the Upanishads of the glorious Bhagavad Gita, the science of the Eternal, the

scripture of Yoga, the dialogue between Sri Krishna and Arjuna, ends the seventeenth discourse

entitled:

“The Yoga of the Division of the Threefold Faith”

THE YOGA OF THE DIVISION OF THE THREEFOLD FAITH

Summary of Seventeenth Discourse

This discourse is termed the “Yoga of the Division of the Three Kinds of Faith”. The theme of this discourse arises out of the question asked by Arjuna in Verse 1 with reference to the final and closing advice of Lord Krishna in the previous discourse, contained in the last two verses therein (Verses 23 and 24). Arjuna asks, “What about those who, even though setting aside scriptural injunctions yet perform worship with faith?”
The Lord replies and states that the faith of such men who ignore the injunctions of the scriptures could be either Sattwic, Rajasic or Tamasic. This would be in accordance with the basic nature of the person himself. And, conversely, as is the kind of faith, so develops the nature of the man.
Thus, in all things like sacrifice, worship, charity, penance, etc., these qualities become expressed in accordance with the kind of faith in which the person concerned is based. They produce results in accordance with the quality of the doer’s faith. These acts done with right faith lead to supreme blessedness. When done without any faith whatsoever, all these actions become barren and useless.