"For the future, I would suggest avoiding subjects of too vast a scale. It would be useful to make out a list of fundamental questions on the matter to be dealt with, and discuss only those"

This quote by Karl Lehmann suggests that when dealing with a subject, it is best to avoid subjects that are too broad. Instead, it is more useful to make a list of the most important questions connected to the subject and focus on those. This advice is helpful since it allows for a more concentrated discussion, which can result in a better understanding of the subject. In addition, it can help to prevent the discussion from becoming too frustrating or convoluted. By narrowing the scope of the conversation, it is easier to stay on track and make development. Eventually, this quote motivates individuals to be conscious of the scope of their conversations and to concentrate on the most important questions.