“To be excellent means to attain something not out of a desire to have more than another, but solely for the fulfilment of the soul (Atman).”
What does it mean to be the best (shreshtha)? To be the best means to gain more knowledge than others — that is, the worth is placed not upon how much knowledge one has gained oneself, but upon how much greater it is than another's. In this way one may become the best for a little while, but no one can remain the best forever, and then that same discontent, pain, and struggle is born once more.
Chapter 17 of 35 — 3 parts, 6 min in total.
Eklavya learns archery from a clay statue and surpasses Drona's own students. Arjuna is the best not because he is the most gifted but because he practises when others stop. Ashwatthama has enormous knowledge and almost no restraint, and it destroys him.
The Gita distinguishes jnana, knowledge, from vijnana, knowledge that has been lived and integrated. Information alone changes nothing. What transforms a person is what they do with it, repeatedly, when nobody is watching.