Bhagavad Gita Verse 24, Chapter 9

aham hi sarvayajnyaanaam bhoktaa cha prabhureva cha |
na tu maamabhijaananti tattvenaatashchyavanti te || 24 ||
 
For I am the recipient and also the lord of all sacrificial rituals, but they do not know me in essence. That is why they fall.
 
aham : I
hi : for
sarvayajnyaanaam : all sacrificial rituals
bhoktaa : recipient
cha : and
prabhuhu : lord
eva : also
cha : and
na : not
tu : but
maam : me
abhijaananti : know
tattvena : in essence
ataha : that is why
chyavanti : fall
te : they
 
Earlier, Shri Krishna asserted that most people worship finite deities with the expectation of finite rewards, but ultimately, all their prayers reach the infinite Ishvara. This type of worship in itself is ok, but the result obtained through this worship can only be finite. Shri Krishna says that the reason most devotees commit this error because they do not recognize Ishvara in essence, they do not comprehend the real nature of Ishvara.
 
Imagine that people from a remote village visit a city. They may mistake a minister’s office for the nation’s government. They may mistake a computer for the Internet. They may mistake a power outlet for the electric grid. Just like such people will commit grave errors unless they understand the presence of the larger in the small, we also will commit errors in our worship unless we understand the real infinite nature of Ishvara.
 
So therefore, when we act in this world, we should always bear in mind that the recipient of any action is Ishvara. When we feed someone, care for someone, help someone in need, we should know that ultimately we are feeding, caring for and helping Ishvara. This will reduce our sense of ego or I-ness.
 
Furthermore, emotions such as pride, greed and jealousy are caused because we think we own something, or we covet something that others own. If we know that the ultimate owner of everything is Ishvara, it reduces our sense of attachment and "mine-ness". Ego and attachment are great obstacles in the path of liberation, and this knowledge cuts them down.
 
What is the fate of such faulty worship? This is taken up next.