Books with a message (and have emotional touch too)

Recently I watched into the wild, good will hunting and fight club movies and I loved all of them so very much!! And all these have a strong message about life and they are very up front with it… so I am looking for something similar in books. So basically something which has a lot of philosophy ig. Also I love the realization the lead characters have at the end of the story!

I am fine with classics or anything. (I am planning on reading Into the wild book later sometime!)