You don't understand anything until you learn it more than one way.

Artificial intelligence is the science of making machines do things that would require intelligence if done by men.

All intelligent problem solvers are subject to the same ultimate constraints - limitations on space, time, and materials.

If we understood something just one way, we would not understand it at all.

It makes no sense to seek a single best way to represent knowledge-because each particular form of expression also brings its particular limitations. For example, logic-based systems are very precise, but they make it hard to do reasoning with analogies. Similarly, statistical systems are useful for making predictions, but do not serve well to represent the reasons why those predictions are sometimes correct.

But the big feature of human-level intelligence is not what it does when it is works but what it does when it's stuck.

Logic doesn't apply to the real world. D. R. Hofstadter and D. C. Dennett (eds.) The Mind's I, 1981.