I'm sure I'm butchering this, but... Alan Kay: an object should be just as powerful as the entire computer, ie an object is a recursive structure. The rest is

I'm sure I'm butchering this, but... Alan Kay: an object should be just as powerful as the entire computer, ie an object is a recursive structure. The rest is implementation details. The implementation details chosen over the past many years, particularly those favored by OOP, generally involve making objects way less powerful than the entire computer.