When we read books, if we do not have an open mind, we tend to only read what we want to believe. This behavior is known as confirmation bias, which means that no matter how many books we read, we still hold on to our original opinions and try to reinforce them. This kind of reading doesn't lead to learning and personal growth.
In the book, "The Mythical Man-Month," an interesting example is given: it takes a woman nine months to give birth to a child. However, if you give nine women the task, you cannot reduce the time it takes to get something done. It takes time, and no extra effort can change that.
In project management, we call this the critical path. We have a critical path to tracking concrete progress from start to finish. However, not all effort contributes to the critical path. To make real progress, we must focus on what matters rather than just how much time and effort we spend.