There is a famous story in the Mahabaratha. Dronacharya wanted to test his students. So he took an imitation bird and kept it on a tree.
And then he called Maharaj Yudhishtara. He asked Yudishtara Maharaj to aim at the eye of the bird. Yudishtara Maharaj strung his bow and was ready aiming. Drona then asked, “What do you see?”
He said, “I see the bird”.
Drona asked, “Do you see anything else”?
He said, “I see the trees, I see my four brothers, I see you, I see the sky”.
And then Drona said,”Step aside”. Then Drona asked Bhima to come forward and asked him to aim at the eye of the bird on the tree. Bhima readied himself.
Drona asked Bhima, “What do you see?”
Bhima said,”I see the bird”.
Drona asked,”Do you see anything else?”
Bhima said,”I see the branch the bird is sitting on, the leaves around”.
Drona said,”Step aside”.
And then Dronacharya called Arjuna. Drona asked Arjuna to take his bow and aim at the eye of the imitation bird on the tree. Arjuna took his mighty Gandhiva bow and with one of his celebrated arrow he aimed at the eye of the bird.
Drona asked Arjuna, “What do you see?”
Arjuna said,”I see the eye of the bird”.
Drona asked,”Do you see anything else”.
Arjuna said,” No, nothing else do I see.”
Drona asked, “Do you see the tree that the bird is sitting on?”
Arjuna replied in the negative.
Drona asked, “Do you see the body of the bird?”
Arjuna replied, “No”.
Drona smiled and again asked,”Do you see the head of the bird?”
Arjuna asserted, “No, I only see the eye of the bird.”
Dronacharya then instructed, “ Now, you shoot”.
And Arjuna shot and pierced the eye of the bird.
H H Radhanath Swami says that in spiritual life if we want to actually achieve the goal, we have to have this one pointed fixed vision on Krsna. We have to make Krsna the object of everything that we do in our life. We have to dovetail all of our activities in His loving service, which is what the Gita teaches us.
H H Radhanath Swami quotes the verse from Bhagavad Gita As it is, Chapter 9.27:
yat karoṣi yad aśnāsi
yaj juhoṣi dadāsi yat
yat tapasyasi kaunteya
tat kuruṣva mad-arpaṇam
“Whatever you do, whatever you eat, whatever you offer or give away, and whatever austerities you perform – do that, O son of Kuntī, as an offering to Me”.