Multiple Inheritance is like a parachute. You don't often need it, but when you do, you really need it.
A fool with a tool is still a fool.
Hierarchy is a kind of order of abstractions.
C++ also supports the notion of friends: cooperative classes that are permitted to see each other's private parts.
The amateur software engineer is always in search of magic.
All of life is iterative. It goes back to the point I made earlier, which is you can't a priori know enough to even ask the right questions.