Anything that is going on in this world, is under the supreme supervision of the Lord. There is a philosopher’s saying, “Not a blade of grass moves without the will of God.” It is actually the fact. Now, we have to dovetail ourselves with that plan of the Supreme Lord. That is called karma-yoga.
So Arjuna understood it, and he dovetailed himself with the supreme will of the Lord. And when he was inquired, “Whether you are going to fight or not after hearing Bhagavad-gita?” he said, “Yes Krishna. My illusion is now removed by Your grace, and I have decided to fight.” Now, that agreement of fighting and in the beginning of Bhagavad-gita, “not to fight,” that is the difference. He made so many arguments with Krishna against fighting. And at the end, he agreed. “Yes.” He became a yes man. So we have to become a yes man to the Supreme Lord. That is the perfection of our spiritual life. Now we are all “no men.” God says this, I say “no.” Stubborn. Now simply we have to say “yes”. That’s all.
Present formation of our existence is to say “no.” Anything godly, we say “no.” We shudder even by the name of God. We have come to a certain stage of our civilized life, that we want to banish God altogether. Not only saying “no,” but we now prepare to agree to the point that there is no existence of God. So how much foolish we are becoming day by day in the name of advancement of civilization. You see? So we should correct this. We shall try to understand our position, “Yes, there is God, and I am servant of God.” That’s all. You have to learn that thing only.
Ref: Srila Prabhupada’s lecture excerpt, Bhagavad-gita 3.13-16 — New York, May 23, 1966