"It was completely fruitless to quarrel with the world, whereas the quarrel with oneself was occasionally fruitful and always, she had to admit, interesting"

This quote by Søren Kierkegaard speaks to the concept that it is futile to argue with the world, as it is too large and complex to be changed by any a single person. Instead, he suggests that it is more advantageous to focus on the person, and to participate in a "quarrel with oneself". This might suggest engaging in self-reflection, or challenging one's own beliefs and worths. This type of self-questioning can be hard, but it can also be rewarding, as it can lead to individual development and advancement. Additionally, Kierkegaard suggests that this kind of self-reflection is always interesting, as it can result in brand-new insights and understanding. Ultimately, this quote encourages us to look inward and to focus on our own development, rather than trying to alter the world.