I wanted to entertain a different sort of question to you guys today. It is a bit more philosophical and more related to things like historiography than to history itself, but as historians I have no doubt you will have interesting answers.
My question is why should we study history? What is the purpose of this knowledge?
The main reason I ask this is because I was debating a history professor over a specific notion. You see, the reason I started studying history was to educate people about the past to understand the future, thus going to the old adage of preventing ourselves from making the same mistakes of the past. He disagreed, claiming historians don't think like that, but since this was during class there was not enough time to elaborate on our arguments.
In my opinion, history must be learned so we can understand our world today, as well as understand what course that world is moving towards. We must use the knowledge of past changes and issues to guide our course. However, many academics I have spoken to adopt a more passive outlook, simply seeing history as a way of categorizing the past. My argument is that learning about the past is useless if we don't apply it to the present and future. Knowledge for the sake of knowledge is useless, and it is part of the reason why academics have a reputation as snobbish and "highfalutin". To me, I see in the past that many learned men who could've stopped major tragedies instead chose to be passive with their knowledge, and I resent them for it. After all, evil men do evil things because good men sit by and do nothing. I personally started to study Middle Eastern history, particularly the history of Islam in the Near East, mostly to educate people about something they know so little about, to prevent them from making uninformed decisions and thus repeating past mistakes. I believe the greatest problem facing the modern world is that the ignorant feel so compelled to act, while the learned are so passive.
However, I want to hear the viewpoints of actual historians on this one. Do you guys agree or disagree with my viewpoint? Do you have other viewpoints you would like to suggest?
I've copied below (slightly edited) the substantive part of an answer I gave to a similar question last year.
I should add that the list below assumes that studying history is important and has a use. This can be and has been disputed. Why can't we study history just for the sake of it?
Lots of people have thought about why studying history is important. They come to slightly differing conclusions. I'll list some different reasons why learning history is important below; the relative importance of these reasons can be debated, but all have been put forth as being of some importance:
Note that this is not an exhaustive list, nor is it a list which all historians would agree with. The points above have been adapted from Glöckel, Geschichtsunterricht (1973) and have been commented on, elaborated on, built upon many times since.