Acharya Drona was the teacher of the princes' of Hastinapur.
Arjuna was his favourite student, so all the other students were jealous
of him. To prove that Arjuna was the best student, Drona decided to
conduct a test .
He hung a wooden bird from a tree and asked each prince to shoot at
the bird's eye. First the eldest prince, Yudhishthira, was asked to try.
When he aimed at the bird, Drona asked him, "what do you see in
front of you?" Yudhisthira answered, "I see a tree and a bird
hearing this, Drona stopped him. He then asked other students the same
question and got the same answer.
When it was Arjuna's turn and Drona asked him the same question, Arjuna
replied, "I see only the bird's eye. Drona was very pleased with
the answer and asked him to shoot. The arrow hit the bird's eye. Drona
told all his students that the best archer is the one who can only see his
target and nothing else.