When Krsna says "This is all right," then it is all right. When Krsna says it is not right, then it is not right. This is our decision. We Krsna conscious men, we simply accept. And that is a fact. That is a fact in this way because Krsna is the greatest authority, Supreme Being. Supreme means the greatest authority. Just like state says "Now it is wartime. If you kill a number of enemies then you will be awarded with gold medal." The same process of killing. But at another time, when there is no war, if you kill one person you'll be hanged. The killing process is the same, but the judgement is given by the greatest authority, the government. "This is all right, this is not right." Therefore, standard of morality means to abide by the orders of the greatest authority. That is standard of morality. This is the conclusion.
Lecture on Bhagavad-gita 2.26-27, London, August 29, 1973