"But the scientific importance of a change in knowledge of fact consists precisely in j its having consequences for a system of theory"

This quote by Talcott Parsons is emphasizing the importance of scientific knowledge and its implications for a system of theory. He is suggesting that when a change in knowledge of fact occurs, it has a significant impact on the system of theory. This is because the change in knowledge of fact can lead to a shift in the way the system of theory is understood and interpreted. For example, if a new discovery is made that contradicts a previously accepted theory, then the system of theory must be adjusted to accommodate the new knowledge. This is why it is important to be aware of changes in knowledge of fact, as they can have a significant impact on the system of theory. In conclusion, Talcott Parsons is emphasizing the importance of scientific knowledge and its implications for a system of theory.