What childishness is it that while there's breath of life in our bodies, we are determined to rush to see the sun the other way around?

This quote is referring to a tendency people have to act impulsively and go against what is good for them. In other words, it is saying that people often choose to do things that are bad for them or harmful, even when they have the ability to make the right choice. This type of behavior could be described as childish or immature because it goes against common sense and often leads to negative consequences.